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Psych Season 4
Country of origin  United States
Network USA Network (USA)
Original run August 7, 2009 – March 10, 2010
No. of episodes 16
Previous season 3
Next season 5

The fourth season of Psych originally aired in the United States on USA Network from August 7, 2009 to March 10, 2010. It consisted of 16 episodes. James Roday, Dulé Hill, Timothy Omundson, Maggie Lawson, Corbin Bernsen, and Kirsten Nelson reprised their roles as the main characters. James Roday portrayed Shawn Spencer, a fake psychic detective who periodically consults for the Santa Barbara police department.





Series # Episode # Title Writer Director Original airdate
48 1 "Extradition: British Columbia" Steve Franks Steve Franks August 7, 2009 (2009-08-07)
While on vacation in Vancouver, Shawn and Gus are suddenly on the trail of elusive art thief Pierre Despereaux (Cary Elwes). Since Lassiter has been trying to arrest this criminal for years, he and Juliet arrive in Canada as well, and Shawn believes that this thief has pulled off the perfect crime, until he realizes what's really going on. 
49 2 "He Dead" Saladin K. Patterson Michael McMurray August 14, 2009 (2009-08-14)
The private jet of billionaire hedge fund manager Warren Clayton crashes in a forest. Shawn and Gus manage to find him first and are asked to fulfill his dying wish: to find out who killed him. His widow (Christine Baranski) is one of the suspects, and as Shawn digs deeper, he uncovers more than a murder. At the same time, Abigail (Rachael Leigh Cook) insists on meeting Henry, which Shawn isn't ready for due to their complicated relationship. 
50 3 "High Noon-ish" Kell Cahoon Mel Damski August 21, 2009 (2009-08-21)
An Old West tourist attraction called Old Sonora, run by Sheriff Hank Mendel (James Brolin), is in danger of being shut down due to sabotage. Since Lassiter is very fond of the town - he spent many weekends there as a child - he enlists Shawn and Gus to investigate. Also guest starring Jim Beaver
51 4 "The Devil is in the Details... and the Upstairs Bedroom" Bill Callahan John Badham August 28, 2009 (2009-08-28)
A college girl commits suicide at a Catholic University. While Shawn believes it to be mere suicide, Father Westley (Ray Wise) - one of the professors at the school - and Gus are convinced the girl was demon-possessed. Although he is skeptical towards that idea, Shawn decides to play along, until the case takes a turn. 
52 5 "Shawn Gets the Yips" Kell Cahoon and Bill Callahan Tawnia McKiernan September 11, 2009 (2009-09-11)
As Shawn, Gus, Lassiter, and Juliet are celebrating Buzz McNab's birthday in a police bar, somebody attempts to rob the place and engages in a gunfight with Lassiter. It is believed that the incident was a random attempt at robbery until Shawn reveals that the gunman was targeting a cop. 
53 6 "Bollywood Homicide" Steve Franks and Anupam Nigam Jay Chandrasekhar September 18, 2009 (2009-09-18)
A young East Indian man named Raj (Sendhil Ramamurthy) believes he is cursed when all of his serious girlfriends - including his fiancée - have all met with suspicious accidents. Shawn and Gus decide to figure out what the real problem is, and Juliet also gets involved in a big way. For Shawn, solving the case is a chance to get back at Lassiter for embarrassing him in front of Abigail (Rachael Leigh Cook). 
54 7 "High Top Fade Out" Saladin K. Patterson and James Roday Steve Surjik September 25, 2009 (2009-09-25)
The death of Leonard "Diddle" Callahan, a computer cryptologist who was the baritone in Gus’s old college a capella group, is suspected to be murder by the other two members (Jaleel White and Kenan Thompson). Although they both had a falling out with Gus, they ask Shawn to investigate, but he and Gus find themselves stonewalled at every turn by the police. 
55 8 "Let's Get Hairy" James Roday and Todd Harthan Andrew Bernstein October 9, 2009 (2009-10-09)
A man named Stewart Grumbley (Joshua Malina) believes he is a werewolf, so he offers Shawn and Gus three times their normal rate to tie him up and observe him. Unfortunately they fall asleep, to find Stewart missing, their window broken, and a tuft of animal hair. Also guest starring David Naughton
56 9 "Shawn Takes a Shot in the Dark" Andy Berman Mel Damski October 16, 2009 (2009-10-16)
Gus, O'Hara, and Lassiter, arrive at a vehicle storage yard after receiving a message from Shawn. They realize he's been shot and abducted - he's been thrown into the trunk of a car - so Henry works with Lassiter to find him, but all they have is a cryptic text message, and Gus' recollection of the case, which involved an overturned ice cream truck. Shawn figures out that the accident was a part of something much bigger. Guest starring Michael Rooker. (Fall Finale) 
57 10 "You Can't Handle This Episode" Andy Berman Mel Damski January 27, 2010 (2010-01-27)
Shawn deduces that a U.S. Army Private who was found hanged was the victim of foul play, and Juliet calls in her brother Ewan (John Cena), a former soldier who has DOD Security Clearance to help them get on the Army base. Unfortunately, Shawn comes into conflict with Juliet over his hunch that Ewan is somehow more deeply involved with the murder. As the case proceeds, Abigail (Rachael Leigh Cook) has some unwelcome news for Shawn. 
58 11 "Thrill Seekers and Hell Raisers" Saladin K. Patterson and Kell Cahoon Mel Damski February 3, 2010 (2010-02-03)
Gus reveals his new girlfriend Ruby (Sarah Shahi) to Shawn, who hasn't forgotten Gus' poor track record with women - he drunkenly got married to a crazy woman in 1997 - but immediately takes a liking to Ruby. Shawn and Gus join Ruby and her friends on a river-rafting trip, and when one of them goes missing, Shawn figures out two things: it was no accident, and Ruby was somehow involved. Gus learns the truth, and is soon put in a compromising position. Also guest stars Stacy Keibler
59 12 "A Very Juliet Episode" Steve Franks and Tim Meltreger Steve Franks February 10, 2010 (2010-02-10)
In 2003, Juliet made a pact with her boyfriend Scott Seaver (Josh Braaten) to meet up in seven years. After he fails to show up, Shawn finds him, and by extension endangers his life since he was a key witness against mobster J.T. Waring (Arnold Vosloo), who was convicted for the murder of a U.S. Marshall. When Waring denies killing the Marshall, Shawn must prove him right in order to protect Scott. 
60 13 "Death Is In The Air" Bill Callahan and Anupam Nigam Stephen Surjik February 17, 2010 (2010-02-17)
A courier named Donny Lieberman (Ernie Grunwald) loses a cooler containing the deadly Thornburg virus, so he asks Shawn and Gus to help him find it, and Shawn realizes that the same lab that Donny was working for is somehow involved. Luckily, they get help from Dr. Steven Reidman (Judd Nelson), the foremost expert on the virus who also expresses interest towards Santa Barbara's favorite psychic. In the race to stop an outbreak, Shawn has an epiphany concerning Juliet. 
61 14 "Think Tank" Steve Franks and Andy Berman Stephen Surjik February 24, 2010 (2010-02-24)
Shawn and Gus are recruited into a think tank to help prevent the murder of business tycoon Ashton Bonaventure (Chris Sarandon). While Shawn doesn't shine in the group, he figures out that someone in the think tank was using it to figure out ways to kill Bonaventure, so he manages to be put in charge of his security and re-assembles the remaining members to help him prevent the assassination attempt. 
62 15 "The Head, The Tail, The Whole Damn Episode" Steve Franks and Tim Meltreger Matt Shakman March 3, 2010 (2010-03-03)
A shark attack victim washes up onshore, and Lassiter notices what appears to be a knife wound on the body. With that, he thinks that the victim was actually murdered, which impresses Shawn since it's a theory that he would come up with. Guest starring Jeri Ryan
63 16 "Mr. Yin Presents" Andy Berman and James Roday James Roday March 10, 2010 (2010-03-10)
As Mr. Yang's (Ally Sheedy) book is released, Shawn and Gus meet up with Mary Lightly (Jimmi Simpson), who believes that Yang had a partner: Mr. Yin, and he turns out to be right when a dead body turns up. As another murder is committed, Shawn, Gus, Juliet, Lassiter, and Henry find themselves in scenarios from classic Hitchcock films in order to stop Yin. Just like Yang, Mr. Yin makes it personal when Abigail (Rachael Leigh Cook) is dragged into his game, but she is not the only victim. 




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