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The text "Metroid"
Genre(s) Action-adventure game
Developer(s) Nintendo (R&D1/Intelligent Systems, Retro Studios, NST), Team Ninja
Publisher(s) Nintendo
Platform(s) NES, Game Boy, Super NES, Game Boy Advance, GameCube, Nintendo DS, Wii
Platform of origin NES
Original release 1986
Official website

Metroid (メトロイド Metoroido ?) is a series of science fiction action-adventure video games conceived by designer Makoto Kanoh and artist Hiroji Kiyotake and produced by Nintendo.[1] Metroid chronicles the missions of bounty hunter Samus Aran who protects the galaxy from the depredations of the Space Pirates and their attempts to harness the power of fictional organisms such as the eponymous Metroids. It is noted for having one of the first female protagonists in a video game, and for its nonlinear gameplay. Metroid combines the platforming of Super Mario Bros. and the exploration aspect of The Legend of Zelda with a decidedly darker atmosphere.[1]

As of 2008, the Metroid series consists of ten games spanning most Nintendo consoles, from the Nintendo Entertainment System to the Wii. It is one of Nintendo's most successful franchises with 16 million games sold, and all of the Metroid games have received some level of critical acclaim.[1] Samus Aran is featured in many other Nintendo-produced games along with secondary characters such as Mother Brain and Ridley. Nintendo has adapted several Metroid games into manga comics, and a live-action movie has been considered.


Common gameplay elements

The Metroid series contains gameplay elements from shooter, platformer, and adventure games.[1] The series is notable for its non-linear progression and solitary exploration format where the player only controls Samus Aran, with few or no other characters to interact with. The series has been a 2D side-scroller in all its incarnations until the Metroid Prime series changed the perspective to a first-person perspective, leading to a new first-person shooter element. The player gains items and power-ups for Samus' cybernetic suit by defeating alien creatures through real-time combat with her arm cannon, which enables further exploration.[1][2] A recurring upgrade is the Morph Ball, which allows Samus to curl into a ball, roll into tight places and plant bombs.[1]

The original Metroid was influenced by two other major Nintendo franchises, including Mario, from which it borrowed extensive areas of platform jumping, and The Legend of Zelda, from which it borrowed non-linear exploration.[1] The game differed in its atmosphere of solitude and foreboding.[1] Metroid was also one of the first video games to feature an exploration to the left as well as the right, and backtracking to already explored areas to search for secret items and paths.[3] Metroid Prime 3: Corruption is the first game in the Metroid series to use extensive voice acting; however, Samus is a silent protagonist.[1] There is very little story explanation in the first few Metroid games, although more backstory was introduced in Super Metroid with its opening narration, and the Prime series with the scan visor that allows the player to read information on walls and computer terminals.[4]

The Metroid games have been popular for speedrunning, which is the act of completing a game in the fastest time possible, since players often receive a better ending if they do so.[1] Metroid had five different endings based on how quickly a player could complete the game, a design unheard of at the time.[1] Super Metroid is one of the most popular speedrunning games, and helped popularize speedrunning in video games through its non-linear design that allowed for sequence breaking through secret passages and other means.[3][5] The original Metroid introduced the challenge of having three minutes to escape from either a planet or a ship that is set to self destruct, which is another recurring gameplay innovation of the Metroid series.[1]

Recurring characters



Samus Aran

The series's heroine, Samus Aran, was orphaned by a Space Pirate attack and subsequently raised by the Chozo, an alien race of bird people. To help her survive their planet's climate, they infused her with their DNA, which also improved her physical abilities. The Chozo trained her to become a warrior and defend the galaxy, bequeathing her with a unique powered exoskeleton called the Power Suit.[6]

The Galactic Federation

The governing body of the galaxy formed by an alliance of alien species,[7] often contracts Samus with difficult missions to complete, with the aim of eradicating the Space Pirates. Samus trained in the Federation's military before becoming a bounty hunter, leaving some time after her commanding officer, Adam Malkovich, died to save her during a mission.[8] The Galactic Federation's troopers also use powered armor, and their technology usually bears multiple versions of their symbol, a stylized cross-shape. Troopers are also given a basic repeating assault weapon, and in Metroid Prime 3, some are equipped with the Phazon Enhancement Device.

The Chozo

A mysterious and sage-like species featured throughout the Metroid series. The origins and age of the Chozo race and civilization are unknown, but they were once spread across several planets in the Metroid universe, though none can be seen alive in the games. Lore entries in Metroid Prime suggest that the race may have traveled to a higher plane of existence as opposed to dying out. The Chozo were extremely technologically advanced, but took pride in their elaborate statuary. They also exchanged knowledge with other species, including the Luminoth of Aether, the Reptilicus of Bryyo, the Elysians of Elysia (robots which the Chozo themselves built), and several other as yet unseen species.[9] They were also responsible for breeding the Metroids.[3] In the Japanese versions of the games, the Chozo are only ever identified by the generic term chōjin-zoku (鳥人族 lit. "race of bird-humans" ?), of which the name "Chozo" is an anglicized version. In Super Metroid, some of the Chozo statues would rise up and attack Samus; these bosses are called Torizos. In Metroid Prime, in later areas in game play, Chozo ghosts appear and attack Samus. Although originally allies, they have been maddened by the Phazon corruption of their planet, and can no longer distinguish friend from foe.



The eponymous in-game Metroids are large jellyfish-like creatures with quadripartite nuclei. They are capable of siphoning an undetectable life energy from any life form, generally causing the death of the victim in the process.[1] This energy can also be siphoned from the Metroid in turn, allowing it to be used as a living power source. The original Metroid establishes that exposure to beta rays would cause them to multiply very quickly.[3] Metroid II: Return of Samus established a five-stage life cycle in which those Metroids native to SR-388 go through two stages of ecdysis followed by two stages of mutation, thus maturing through five previously unknown forms: Alpha, Gamma, Zeta, Omega, and Queen.[3] Metroid Prime introduced three new, Phazon-mutated forms: Hunter Metroids, Fission Metroids, and Metroid Prime itself. Metroid Prime 2: Echoes has a Phazon-mutated strain of Metroid, the Tallon Metroid. Instead of siphoning all of their power from victims, they can feed directly off Phazon. They are born as Infant Metroids from cocoons and mature into adulthood when exposed to Phazon. The game also introduces Dark Tallon Metroids, Tallon Metroids corrupted by the Ing. In Metroid Prime 3: Corruption, three new mutations of Metroid appear: Phazon Metroid, which is almost exactly like a common Metroid, except that it is capable of phasing in and out of local timespace; Hopping Metroid, which cannot hover, phase out of local timespace, or drain energy, but can fight using its claws as melee weapons and armor for defense; and the Metroid Hatcher, a boss which can float and spawn Phazon Metroids, but cannot phase out of local timespace. Though Metroids are dangerous animals, they are presumably not intrinsically sinister or evil. At the end of the first game in the series, Samus spares a baby Metroid which adopts her as its parent. This Metroid later reappears in the sequel, and in saving Samus's life is killed by Mother Brain.

Space Pirates and Leaders

A hostile group known as Space Pirates serve as the antagonists of the Metroid series. They are a group of "interstellar nomads" resembling humanoid insects or crustaceans, who plunder colonies and ships. A single Pirate may have many biological differences between individuals of their own species, most likely because of their willingness to perform self-experimentation and mutation. Important leaders include Ridley, the Space Pirate commander, Mother Brain, the biomechanical defense of Zebes controlled by the Space Pirates, and Kraid, a recurring boss. The organization also includes a winged, mantis-like species, the Ki Hunters. The Space Pirates are interested in Metroid research, especially in using Metroids for energy generation, as soldiers, and for experimentation – their Phazon experiments produced all the Metroid variants seen in the Prime games with the exception of Metroid Prime itself.

One of Samus's recurring adversaries, Ridley, is a high-ranking Space Pirate. Ridley shares features with both the pterodactyl and the mythical European dragon.[1][6] Ridley's exact rank is unknown, with some sources referring to him as the general of the Space Pirates.[3] Ridley directly led the Space Pirate attack on Samus's home colony of K-2L, which inevitably led to the deaths of all the colonists including Samus's mother and father.[10][6] Samus has since had a personal vendetta against Ridley because of this, coupled with her objective to rid the galaxy of Space Pirates.[1][6] Over the course of her adventures, Samus confronts several different incarnations of Ridley in the series, such as Meta Ridley from Metroid Prime and Metroid Prime 3, Omega Ridley from Metroid Prime 3, and also an X parasite clone in Metroid Fusion and a mechanized version in Zero Mission.[6][11] Ridley appears in the introduction and as a trophy in Super Smash Bros. Melee. In Super Smash Bros. Brawl, both Ridley and Meta Ridley are boss characters in the Subspace Emissary.

Kraid is a gigantic dinosaur-like beast allied with the Space Pirates, possibly one of their leaders.[6] First appearing in the original Metroid, he is the first part of the mini-boss duo along with Ridley.[11] In Super Metroid he appears in his giant form, two screens tall and almost a screen wide. Metroid: Zero Mission retconned his size and appearance, showing he did not grow between games.[12] He was also slated to appear in Metroid Prime as a boss in the Phazon Mines, with a metal dome covering his head and blue Phazon veins on his belly, but was removed due to time constraints.[13] Kraid also makes a guest appearance in the background of the Brinstar Depths stage in Super Smash Bros. Melee.

Mother Brain is a recurring game boss in the series. Its exact status has always been unclear, as it has been referred to as the general of the Space Pirates, a supercomputer that operates the Space Pirate-occupied world of Zebes, or a councilor of the Chozo.[3][14] Mother Brain is depicted as a very large brain with cybernetic spikes and a single eye; usually contained in a glass tube which Samus must break to attack it, Mother Brain also rises from the floor with a grotesque body in Super Metroid. Samus seemingly destroys Mother Brain in the original Metroid, but again confronts it in Super Metroid and this time Samus is almost defeated, but the baby Metroid intervenes and Samus once again defeats Mother Brain. It was revealed in Metroid Prime 3 that the Galactic Federation had constructed biomechanical supercomputers called Auroras, and that there were plans for a "Future Aurora Complex", which appears to be the Mother Brain as depicted in Super Metroid.[14] In the trailer for Metroid: Other M, the scene of Mother Brain destroying the baby Metroid is reenacted in a FMV cutscene.


A highly radioactive and mutagenic compound, Phazon is a major plot element of the Metroid Prime trilogy.[3] Some decades before Metroid Prime, a Phazon meteorite crashes into Tallon IV. Later, Samus responds to a distress signal from the Space Pirate frigate Orpheon orbiting Tallon IV. Her investigation leads her to the surface of the planet discovering several Space Pirate bases and the Metroid Prime itself. Metroid Prime is a Metroid that has become highly evolved and mutated by Phazon exposure. Though it is defeated by Samus, the creature absorbs her Phazon Suit and copies her genetic code, ultimately becoming Dark Samus, a major antagonist in the Prime series.[3] Metroid Prime 2: Echoes sees Samus fighting against Dark Samus as it attempts to absorb more Phazon to survive on the planet Aether. She also confronts the Ing, a demon-like extraterrestrial race from Dark Aether, the dark parallel of Aether. Dark Aether and the amorphous Ing that inhabit it were created by a different Phazon meteor impacting an undetermined time ago splitting the planet and its energy in two. Corruption introduced an extraterrestrial called the "Phaz-Ing" which had similar characteristics to the "Inglet", a member of the Ing race. This brings to question whether the Ing are Phaz-Ing exposed to Dark Energy or previously existed. Metroid Prime 3: Corruption is centered around Dark Samus, in conjunction with the Space Pirates, spreading Phazon across the galaxy by infecting planets and several hunters with it, including Samus. Samus's body begins to naturally produce Phazon, but is in danger of corruption because of overexposure. Samus eventually tracks Dark Samus to the planet the compound originated from, Phaaze, and defeats Dark Samus and destroys all Phazon as a result.

In Metroid Fusion Samus faces another opponent, the X-Parasite, a parasitic life-form from planet SR388. These creatures were originally the prey of the Metroids but have now multiplied out of control following the eradication of the Metroids in Metroid II. An X infects Samus but she is saved by a vaccine created from the DNA of the Metroid hatchling she spared from Metroid II and Super Metroid. Some of the X infect her suit and become a clone of Samus called the SA-X, which has the same powers and capabilities as Samus at full power and uses these to assist the other X. Although Samus is ordered by the Federation to destroy the X, they secretly desire to capture the creatures for themselves, and intentionally sabotage Samus's mission to keep her from destroying too many of them (a fact that enrages Samus upon her finding out). Samus is able to exterminate all X by destroying SR388 and the space station Fusion takes place on.


The eleven games in the Metroid series focus on the adventures of Samus Aran and her assignments to wipe out threats to the Galactic Federation presented by the Space Pirates and their attempts to harness various biological weapons such as the Metroids and Phazon.

The chronology of the Metroid fictional universe does not match the release order of the games.[15] This section lists the games in chronological order, rather than the order of release.

Metroid/Metroid: Zero Mission (1986/2004)
Samus travels through the caverns of the planet Zebes to stop the Space Pirates from exploiting the Metroid species for galactic domination. She confronts the cybernetic lifeform Mother Brain, as well as its guardians, Kraid and Ridley.[11] The 2004 remake Metroid: Zero Mission has an addendum to the storyline—after the defeat of Mother Brain, Samus was ambushed by Space Pirates and her ship crash-lands back on the surface. Stripped of her Power Suit and her ship destroyed, she is forced to infiltrate the Space Pirate mothership to find a way off the planet with only an emergency pistol for protection. After receiving a fully powered suit from deep within the Chozo ruins, she defeats Ridley Robot and escapes from the mothership before it self-destructs.[6][3]
Metroid Prime (2002)
Approximately three years after the events of Metroid, Samus receives a distress signal in her new ship and travels to Tallon IV to stop the Space Pirates from exploiting a powerful radioactive substance known as Phazon. She discovers that the Chozo once settled on this planet, and their disappearance, as well as the emergence of Phazon, is due to a meteor impacting the planet decades ago. After ruining a Space Pirate mining operation and collecting the twelve Chozo Artifacts that allow access to the sealed impact crater, she confronts and seemingly destroys Metroid Prime, a Metroid that had been feeding off the Phazon Core of the meteor to increase in size and strength.[3]
Metroid Prime Pinball (2005)
Metroid Prime Pinball is not a separate canon game in the Metroid storyline, but a retelling of the original Metroid Prime's story in pinball format.[16]
Metroid Prime Hunters (2006)
When the Federation receives an unusual telepathic message, Samus is sent to the remote Alimbic Cluster in the Tetra Galaxy to uncover the rumored "Ultimate Power". Six rival bounty hunters that also heard the message actively attempt to secure the power before anyone else, including Samus. It transpires that the promise of ultimate power was actually a lie sent by the creature Gorea, sealed away by the Alimbics in a void between dimensions. Gorea attacks and sucks the energy and weapons from the hunters. After killing Gorea, Samus and the other hunters escape the cluster, empty handed, but alive.[3]
Metroid Prime 2: Echoes (2004)
Samus is sent to investigate the planet Aether after a squad of GF Marines was lost there. Samus finds them all dead, killed by several creatures, mostly by an evil race called the Ing. The Ing possess life forms, transforming them into monstrous "dark" versions of their former selves to wage war with Aether's dominant race, the Luminoth. Upon meeting the only remaining member of Luminoth (the others are frozen in stasis chambers, awaiting the destruction of the Ing), Samus learns Aether has been split into two dimensions by a meteor similar to the one that crashed on Tallon IV. Samus agrees to assist by recovering Aether's planetary energy (the "Light of Aether") from Dark Aether and thereby putting an end to Dark Aether and the Ing; however, Samus yet again encounters Metroid Prime, a heavily mutated being who had copied Samus' genetic code and stolen her Phazon suit at the end of her Tallon IV adventure, now in the form of Dark Samus.[3]
Metroid Prime 3: Corruption (2007)
Space Pirates shut down Galactic Federation computer systems and then engage in large scale combat in an attempt to further spread Phazon. Enormous Phazon-based seedships, known as Leviathans, impact planets and begin corrupting them with Phazon. Samus is charged with destroying the 'Phazon Seeds' and restoring functionality to the Federation's computer network. After purging three planets of Phazon (including the Space Pirate homeworld), the Federation locates the source of Phazon, planet Phaaze, which is made entirely of Phazon. As the Federation engages the Space Pirates in orbit, Samus enters the depths of the planet and succeeds at finally destroying Dark Samus and Phazon once and for all.
Metroid II: Return of Samus (1991)
The Galactic Federation deems the Metroid species too dangerous to exist, and after their own failed attempts, employs Samus to travel to the Metroid homeworld, SR388, and exterminate the entire species. After killing every Metroid (among them Alpha, Gamma, Zeta, and Omega Metroids) and the Queen Metroid, Samus finds an unhatched egg behind the Queen Metroid's chamber. Before Samus fires on the Metroid egg, an infant Metroid hatches and believes Samus to be its mother. Helping her escape back to her ship, it is handed over by Samus to the research station, Ceres, for study.[11]
Super Metroid (1994)
Before the scientists can conduct extensive research, Samus receives a distress signal from the research lab. She returns just in time to catch Ridley stealing the hatchling, having killed all of the scientists. She then follows Ridley to the rebuilt base on Zebes to stop the Space Pirates in their new plan to clone the Metroids and use them as a weapon. She kills the reborn versions of Ridley and Kraid, as well as new guardians Phantoon and Draygon, to confront Mother Brain once again.[3] Samus is nearly killed in the battle, but is saved, and her suit supercharged, by the Metroid hatchling, shortly before Mother Brain kills it.[11] Samus proceeds to destroy Mother Brain, and once again escapes Zebes during a countdown to an explosion. This time, the entire planet explodes, taking with it the few remaining cloned Metroids.
Metroid: Other M (2010)
A new title featuring story, cutscenes, and dialogue new to the franchise. Series director Yoshio Sakamoto confirmed the title as an interquel between Super Metroid and Metroid Fusion.[17]
Metroid Fusion (2002)
While acting as a bodyguard for researchers on the planet SR388, Samus is infected by a native creature known as the X Parasite, originally the prey of the Metroid species.[3] Doctors surgically remove portions of her Power Suit and cured the X infection with a vaccine created from the DNA of the baby Metroid from her previous adventure.[3] The vaccine not only allows her to survive the parasites, but to absorb them to power up her energy and weapons. She is then sent to investigate a disturbance at the Biologic Space Labs research station, where it is revealed that specimens from SR388 had been carriers of the X parasite. An X mimicking Samus, nicknamed the SA-X, has taken control of Samus's old suit, methodically breaking into different parts of the station to allow the X parasites to infect the entire station.[11] While trying to destroy the rapidly multiplying X as well as clones of the SA-X, Samus discovers a secret Federation Metroid breeding program. Realizing the threat this would pose, Samus' shipboard computer, Adam, suggests that she alter the station's propulsion to intercept with SR388 and destroy the planet as well to finally wipe out the X and Metroid populations.[3] After changing the station's propulsion, Samus races back to her ship, where she encounters an Omega Metroid combating the weakened SA-X she had fought earlier. The SA-X is quickly destroyed by the Metroid, and Samus absorbs the SA-X parasite to use her regained weapons to destroy the Omega Metroid and leave the station before it collides with SR388.[3]



A video game screenshot. A person in a powered exoskeleton travels through a cave, while winged monsters hang from the ceiling.
Metroid provides a thoroughly nonlinear gaming experience.

In the mid-1980s, Nintendo's Research & Development 1 team started simultaneous development of two games for the Famicom Disk System: Kid Icarus and Metroid. The two games, both released on the same day in 1986, have been called "companion games", as they shared developers and gameplay elements such as the introduction of the game saving password system in the North American release.[18][3]

Metroid II: Return of Samus was released for the Nintendo Game Boy in 1991 in North America and 1992 in Japan. It was the first game of the Metroid series whose North American release featured a save system, allowing the player to have three separate save files. Metroid II also established the current "look" of Samus Aran and her Power Suit, namely the bulky look of the Varia Suit upgrade and the visual difference between the "Beam Mode" and "Missile Mode" of Samus' arm cannon.

Director Yoshio Sakamoto began planning concepts for Super Metroid in early 1990, but his studio was committed to making another game, so developers from Intelligent Systems were brought in to help complete the game.[19] After Super Metroid's release, there would not be another sequel for eight years. A Nintendo 64 title was considered during the period, but Nintendo "couldn't come up with any concrete ideas".[20] In 1999, Retro Studios, a newly formed second-party developer based in Austin, Texas, was given the project for Metroid Prime. Nintendo rarely allows overseas teams to work on its games but this was one occasion when they allowed a high profile title to be developed by a studio outside of Japan.[21] After it became a top seller on the GameCube, a trilogy was authorized.[1]

Rumors abounded since 2005 about the development of a title called Metroid Dread, supposedly a 2D side-scroller for the Nintendo DS. In Metroid Prime 3: Corruption, there is a message in the Metroid breeding zone of the Space Pirate Homeworld on a computer panel that if scanned says "Experiment status report update: Metroid project 'Dread' is nearing the final stages of completion." Developers from Retro Studios gave a full but cryptic denial of any connection with the rumored game, and Nintendo denied they were making another 2D Metroid title.[22][23][24][25] However, at E3 2009, Sakamoto confirmed Metroid Dread existed at one point, and may still be in development.[26][27]

A new Metroid title was announced at E3 2009, entitled Metroid: Other M. This title is being developed in cooperation with Team Ninja and directed by long-time series director Yoshio Sakamoto. It is slated for release on the Wii in 2010.[17]

Creation and design

A video game screenshot. A weapon points outwards towards a snowy landscape.
Metroid Prime introduced 3D to the series.

Metroid was designed to be a shooting game that combined the platform jumping of Super Mario Bros. with the non-linear exploration of The Legend of Zelda and a distinctly darker aesthetic. Half way through development, one of the staff said to his fellow developers "Hey, wouldn't that be kind of cool if it turned out that this person inside the suit was a woman?", and the idea was accepted.[1][28] While Alien was never mentioned during development, the team is said to have been influenced by the film's atmosphere, and the series has since been one of their biggest inspirations.[29]

Metroid, Super Metroid, Metroid Fusion and Metroid: Zero Mission were all developed by Nintendo's internal R&D1 section. The games which have been developed by separate teams are Metroid II: Return of Samus (Intelligent Systems), Metroid Prime, 2, and 3 (Retro Studios), Metroid Prime Hunters (Nintendo Software Technology Corporation), Metroid Prime Pinball (Fuse Games)[3], and Metroid: Other M (Project M). The central figures in the production and development of the Metroid series are Yoshio Sakamoto who has directed or supervised the development of all the games (excluding Metroid II), Gunpei Yokoi who headed the Research & Development 1 team and produced the first three games before his death in 1997, Makoto Kanoh who directed and designed scenarios for the first three games, and Hiroji Kiyotake who designed the characters for the original game.[1] Shigeru Miyamoto, who made the Mario and The Legend of Zelda series, has not been involved with the production of Metroid, but he did act as producer for both Metroid Prime and its sequel.


The Metroid series has been noted and praised for its unique style of video game music.[1][30][31] Hirokazu 'Hip' Tanaka, composer of the original Metroid, has said he wanted to make a score that made players feel like they were encountering a "living organism" and had no distinction between music and sound effects.[30] The only time the main Metroid theme was heard was after Mother Brain is defeated; this is intended to give the player a catharsis. At all other times, no melodies are present in the game.[32] The composer of Super Metroid, Kenji Yamamoto, came up with some of the games' themes by singing them while riding his motorcycle. He was asked to compose the music for Metroid Prime to reinforce the series' continuity.[33] Metroid Prime's Dolby Pro Logic II surround sound was mixed by a member of Dolby Digital.[34] Developers from Retro Studios noted how the process of fitting all the sound effects and music for Metroid Prime in 6 MB of space was crucial in producing a quality soundtrack, as each sound had to be of very high quality to be included.[33] Composer Kenji Yamamoto utilizes heavy drums, piano, voiced chants, clangs of pipes, and electric guitar.[34] Metroid Prime 3 took advantage of the increase in the amount of RAM that took place when the series switched from the GameCube to the Wii; this allowed for higher quality audio samples to be used and thus a better overall audio quality.[33] Kenji Yamamoto, who composed the music to Super Metroid and the Prime trilogy, copied the musical design of the original Metroid in Metroid Prime 3, by keeping the music and themes dark and scary until the very end, when uplifting music is played during the credits.[33]

In other media

Characters and elements from the Metroid series have appeared in different mediums. Samus has appeared in Nintendo games such as Super Mario RPG, Tetris (Nintendo Entertainment System version), Tetris DS, Galactic Pinball, Kirby Super Star, and WarioWare.[3][35][36] Several characters and game environments have appeared in the Super Smash Bros. series. Samus is a playable character in all three Super Smash Bros. games.[37][38] Super Smash Bros. Brawl, also features Zero Suit Samus, a version of the heroine using the blue form-fitting suit seen in Zero Mission and the Prime series.[39][40] Ridley makes cameos in Super Smash Bros., where he can be seen flying through the level Zebes, and in Super Smash Bros. Melee both as a unlockable trophy and in the game's opening, where he is fighting Samus at Ceres Space Station.[41] In Super Smash Bros. Brawl, Ridley, in both normal and Meta Ridley forms, appears as a boss character.[42] Kraid also appeared in Super Smash Bros. Melee as a stage hazard in Brinstar Depths and unlockable trophy. Comics and manga have been made for various magazines based on Metroid,[43] Super Metroid,[44] Metroid Prime,[45] Metroid Prime 2: Echoes,[46] and Metroid: Zero Mission[47] in both the United States and Japan. Samus Aran and other Metroid characters also feature in the Captain N: The Game Master comic books by Valiant Comics.[48] Mother Brain was also the main villain in the Captain N: The Game Master TV show.[49] Metroids were an enemy encountered by Pit in the NES game Kid Icarus.[3] Six short "E-comics" were created to chronicle Samus' life and were published by Kodachi.[3] Comic Bom Bom also published a three-volume manga starring Samus called Samus and Joey (メトロイド サムス&ジョイ) [50]

Live-action movie

In 2003, two producers optioned the rights to create a movie based on Metroid, but the rights expired.[3] John Woo reacquired the rights a few years later, and Lion Rock Productions was to produce and release the film before 2006, but it has either been canceled or remains in development hell.[3][51] On April 1, 2005, IGN posted an April Fool's Day article reporting critically panned director Uwe Boll would be directing the Metroid movie, with Samus being portrayed by Michelle Rodriguez, who stated the Nintendo GameCube is for kids.[52]


Aggregate review scores
Game GameRankings Metacritic
Metroid (GBA re-release) 62%[53] 58%[54]
Metroid II: Return of Samus 80%[55]
Super Metroid 96%[56]
Metroid Fusion 91%[57] 92%[58]
Metroid Prime 96%[59] 97%[60]
Metroid: Zero Mission 90%[61] 89%[62]
Metroid Prime 2: Echoes 92%[63] 92%[64]
Metroid Prime Pinball 81%[65] 79%[66]
Metroid Prime Hunters 84%[67] 85%[68]
Metroid Prime 3: Corruption 90%[69] 90%[70]

The series has been highly praised by critics, being ranked by IGN as the eighth best franchise ever.[71] In 2001, Electronic Gaming Monthly chose Super Metroid as the best game ever.[72] The Metroid games have since appeared in other "best game" lists, with all games released up to 2005 included in a Nintendo Power "Top 200 Nintendo Games list",[73] Prime in the IGN top 100,[74] Metroid, Super Metroid, Prime and Echoes in a list by GameFAQs users;[75] Metroid and Super Metroid in Game Informer's list;[76] and Prime and Super Metroid in Edge's list.[77] The series has been influential in many other games, including Castlevania: Symphony of the Night.[2] The games have also sold very well, with Super Metroid, Metroid Fusion, Metroid Prime, and Metroid Prime 3: Corruption exceeding one million copies sold.[78][19][79] Some characters have received their own reception. Ridley was the number two most requested Nintendo character by IGN and number one by the fans to be added as a playable character to the Super Smash Bros. series[42] and Mother Brain has been commonly ranked among the all-time best video game bosses.[80]

The original Metroid has been described as being boosted by its "eerie" music, adding a "sense of mystery and exploration" to the game by making the game "moody and atmospheric".[1][30] IGN praised the well timed music that helped add suspense to the experience.[31] GameSpot described Super Metroid as better than the original "in literally every conceivable way",[81] Metroid Fusion was noted for its "understated score" which fit the mood of the adventure and its excellent stereo sound effects, making it an uncommonly good Game Boy Advance sound experience.[82] Metroid Prime was considered one of the best games ever upon release, winning Game of the Year from various publications and websites.[83][84][85] IGN called the aural experience with Metroid Prime 2: Echoes "mesmerizing".[86] Music from Metroid has been frequently re-released as part of "best of" video game music releases.[87][88][89] Metroid Prime's soundtrack was called the best sound design on the GameCube. The sound effects were also noted for a high degree of accuracy and blending with the soundtrack.[34] On the popular video game music site OverClocked ReMix, Super Metroid is the tied for the tenth most remixed video game, with Metroid tied for twenty-fifth.[90]

Sales of Metroid games in Japan have typically been lower than in the United States. In particular, the first two installments of the Metroid Prime series did not sell well in Japan. In its first day of release in Japan, Metroid Prime 3: Corruption sold 20,000 copies,[91] and it was the fifth bestselling game during its debut week in Japan, selling 32,388 units, ranking it behind Ryū ga Gotoku Kenzan!, Super Smash Bros. Brawl, Wii Fit, and Gundam Musou Special.[92]


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External links



Up to date as of February 01, 2010

From Wikia Gaming, your source for walkthroughs, games, guides, and more!

Work in progress
This article has been marked for re-styling.
The title of this article is incorrect because of technical limitations. The correct title is Metroid.

The Metroids are fictional creatures within the Metroid universe.

A Metroid's metamorphic stages.

The Metroids were created by the Chozo as a means of eradicating the X Parasite that plagued the planet SR388. Though they were successful in suppressing (but not fully eliminating) the X Parasite, the Metroids eventually killed off the remaining Chozo inhabitants of the planet. Researchers for the Galactic Federation later discovered Metroids on SR388, in a state of suspended animation (most likely a result of a final desperate attempt by the Chozo to keep the Metroids in check.) While studying the creatures, the researches found that exposure to beta rays for 24 hours was all that was needed not only bring the Metroids back to life, but to allow them to asexually reproduce themselves. As the ship made it's way back to the Galactic Federation base it was ambushed by Space Pirates who killed the researchers and stole the Metroid cargo. Fortunately, Samus Aran, a bounty hunter working for the Galactic Federation, stopped the Pirates and destroyed their Metroids.

Eventually the Galactic Federation decided to send a team of unarmed defenseless researches to SR388, to make sure there were no more Metroids on the planet, as the creatures are enormously dangerous. When contact with the researchers was lost, a search and rescue team was sent to the planet. They were never heard from again. After that, a special combat group of Galactic Federation Police were sent to SR388. They were also never heard from again. When the Galactic Federation got bored with sending hundreds of people to certain death, they decided call on Samus Aran once more.

Samus arrived on SR388 and eliminated the Metroid Queen and all of her remaining offspring, except for one. The Metroid she saved (referred to as the Baby Metroid) hatched after she killed the Metroid Queen, and because Samus was the first thing it saw, it thought that she was its mother. It helped her escape the collapsing Metroid hive by eating away the walls.

The Baby Metroid was sent to the Galactic Federation for medicinal research, as the Metroids have astonishing regenerative abilities. Though the Metroid can absorb an X Parasite by simply making contact with it, the X Parasite can protect itself by creating an outer shell that can mimic any life form. Because of this the Metroids were created with the ability to sap nutrients out of most life forms by latching their claws onto the victim's skull and then sucking the life force energy directly out of their body—a brilliant move by the Chozo. The Metroids are very robust, and their only known weakness is extreme cold. They were created with radically unstable DNA, allowing them to mutate and take on new forms. This was probably intended to make them efficient hunters of the shape-shifting X Parasite.

Most Metroids are green.
But sometimes they're red.

Though Samus wiped out the only existing Metroid hive and it's queen, both the Galactic Federation and the Space Pirates have made Metroid clones from DNA taken from the Baby Metroid.

There have been several Metroid outbreaks (most of the Metroid games take place during such outbreaks) that were stabilized by Samus. The Galactic Federation considers her to be the only person capable of stopping the Metroids, as only she can harness the Chozo weapon technology specifically designed to fight them. Samus was raised by the Chozo and has Chozo DNA fused in her blood, allowing her to wear a modified Chozo powersuit and use Chozo devices. Probably the most important of these is the Ice Beam, which can freeze a Metroid, making it much easier to destroy. Most of the remaining Chozo have either died out or left the part of the universe wherein the series take place. At the end of Metroid Fusion, Samus realized that her death would mean an eventual unstoppable Metroid outbreak, and that she must preserve her own life at all costs until the Metroids have been fully exterminated.

Metroid Prime.
If you see a Dark Metroid, you run. You run your ass off.

The Metroids are rarely seen in their natural state in the Metroid games. Only in Metroid 2: Return of Samus did Samus fight full-grown Metroids. In other games, the Metroids have been exposed to foreign elements that caused them to mutate into various forms. Some forms are immune to ice, but weak to other types of energy. The most notable Metroid mutation is Metroid Prime, a creature created by the Space Pirates by fusing a Metroid with Phazon and Space Pirate weapon technology. Metroid Prime eventually got out of control and the more the pirates fought it, the more it learned to emulate their weapons and fighting styles. Metroid Prime was ultimately terminated by Samus Aran. What was left of Metroid Prime is believed to have become Dark Samus, after having absorbed Samus' Phazon Suit. (In other versions of the game Metroid Prime was brought to Tallin IV by a great meteor)

Since the Space Pirates landed on Aether in Metroid Prime 2: Echoes, Dark Samus wasn't the only Metroid-related creature on the planet. The Metroids the pirates brought with them got loose, of course, and some of them were possessed by the dark Ing. What resulted was probably the most terrifying form of Metroid yet, the Dark Metroid.

In the latest game in the Metroid timeline, Metroid Fusion, Samus Aran was in an accident that required fusion with the Baby Metroid's DNA to survive. She was later sent to the Biologic Space Labs to use her Metroid DNA infused suit to take care of an X Parasite outbreak. The Metroid DNA allows her to absorb an airborne X Parasite by simply making contact with it once its exterior shape-shifted clone body thing has been destroyed. Though the X Parasite appears to be eliminated, Samus found a hidden lab full of Metroids in the Biological Space Labs, which was jettisoned into space soon after her discovery of it. The current location of this lab and the Metroids within it is unknown.

Metroid stub
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Stubs are articles that writers have begun work on, but are not yet complete enough to be considered finished articles.

Metroid series
Metroid - Metroid 2: Return of Samus - Super Metroid - Metroid Prime - Metroid Fusion - Metroid: Zero Mission - Metroid Prime 2: Echoes - Metroid Prime Pinball - Metroid Prime: Hunters - Metroid Prime 3: Corruption - Metroid Prime Trilogy - Metroid: Other M
Samus Aran
Mother Brain - Ridley - Kraid | Metroid - Phazon
Space Pirates | X Parasite | SA-X | Ing
Metroid timeline - Samus's suits - Samus's visors - Samus's beams - Morph Ball -Screw Attack - Speed booster - Galactic Federation - Chozo
Planets: Zebes - SR388 - Aether

This article uses material from the "Metroid (species)" article on the Gaming wiki at Wikia and is licensed under the Creative Commons Attribution-Share Alike License.

Simple English

A Metroid is an alien in the Metroid series. They are usually seen as flying transparent green creatures. They are major enemies in the series, though rarely is a Metroid the main villain.


Metroids are hovering creatures who attach to its prey to take in their energy.

Life cycle

  • Metroid - The first form which is the most common form. This is the only Metroid that can absorb energy.
  • Alpha Metroid - The second form is a lot larger than regular Metroids, with a larger body and larger spikes.
  • Gamma Metroid - The third form is the even larger than the Alpha Metroid.
  • Zeta Metroid - The fourth form is very different from the first three forms. It loses its transparent shell and grows a tail and feet, but still hovers.
  • Omega Metroid - The fifth form is a larger version of the Zeta Metroid, which is slower and heavier but more powerful and hovers like the other Metroids. It is much different in Metroid Fusion, and can't hover at all.
  • Metroid Queen - The final form of the Metroid. Only two have been encountered by Samus in the series. It's a large monster with a shell and a long neck.


Metroids were created by the Chozo species, an ancient and wise alien species to stop a killer virus called "X" from killing them off.

Samus Aran first finds the Metroids on a planet called Zebes in the base of Mother Brain during Metroid. She also finds many Metroids in the three Metroid Prime games including a powerful Metroid called "Metroid Prime", which take place soon after Metroid. Samus is asked by a group called the Galactic Federation to exterminate the Metroid race on a planet called SR388. Samus kills almost every Metroid including the Metroid Queen, but finds a baby Metroid that hatched when Samus found it, and brings it back to the Galactic Federation (as seen in Super Metroid). Samus returns to Zebes in Super Metroid after a monster called Ridley captures the baby Metroid and brings it there for his master, Mother Brain. Samus finds more Metroids there, including the baby Metroid which had grown very large, even larger than Samus. It doesn't try to attack her because it thinks Samus is its mom, and when Samus is about to be killed by Mother Brain, the Metroid tries to protect Samus, but is killed by Mother Brain, falling onto Samus and fusing with her. Samus kills Mother Brain and escapes from Zebes right before it explodes. Metroids are extinct after this, and because of this, the X virus that the Metroids were immune to started to come back and infest SR388. The X virus infects its host by entering the body, killing them, and copying their look. Samus is infected by one of these and is almost killed, but someone gives her a shot of Metroid DNA that kills the X virus, but also makes her immune to being killed by them. Samus goes to the BSL Space Station to find that the scientists in it were killed by the virus, and Samus has to explore the ship while also avoiding her old suit that an X virus took control of called SA-X. Samus discovers that the Galactic Federation had been cloning the Metroid, and at the end of the game, Samus encounters an Omega Metroid, the final life cycle of the Metroid species (besides Metroid Queen).


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