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"Similitude" is the title of an episode from
the third season of the television series
Star Trek: Enterprise. It first aired on 19 November 2003
and was the sixty-second episode of the series.
The story involves Phlox, whom Archer orders
to grow a mimetic symbiote as the source of a transplant for
Trip when an injury threatens Trip's life.
Meanwhile, Trip lies unconscious in Sickbay.
The symbiote is born, and Phlox names him "Sim". By the end of
the episode, however, the story becomes tense: Phlox must
perform the transplant before the end of Sim's fifteen-day
lifespan, and, according to Phlox, the procedure will be fatal to
Sim. Phlox makes this startling discovery only after Sim's
genesis; previously, Phlox had calculated that the procedure
wouldn't interfere with Sim's lifespan. Sim vehemently
protests the procedure; he expresses a strong desire to live
through the rest of his natural life—Trip's own life
notwithstanding. In a conversation with Archer, Sim desperately
tries to persuade him to forbear his death, but Archer would rather
he voluntarily submit to the procedure. "You're not a murderer",
Sim says in the scene, to which Archer replies, "Don't make me
The story is further complicated when the audience learns of an
experimental procedure, involving a certain enzyme, that might
allow for an extension (presumably by decades) of Sim's lifespan.
Apparently, Phlox was aware of this procedure, but he concealed his
knowledge of it; according to his sensibility, its uncertain nature
precluded it from being worthwhile even to consider.
Sim eventually volunteers himself to the transplant once and for
all, but before he does, several events, important to the plot,
- Sim visits Main Engineering, so that he may spend time with
activities he loves most: maintaining the warp engine, and being in the presence of T'Pol, toward whom he has
outspokenly developed romantic feelings.
- Later, in a scene immediately prior to the transplant procedure
in Sickbay, T'Pol gives Sim a kiss. The cause of her non-Vulcan
action would be explained in later episodes.
- Sim nearly escapes in a shuttlepod. When he makes the attempt,
Archer is alerted on the command bridge to an unauthorized presence
in the shuttlebay. Archer then visits the shuttlebay directly, and
finds Sim leaning against one of the shuttlepods in a
contemplative, though resolved, pose. Sim immediately confesses to
considering escape, but then says he finds the idea of spending the
rest of his life in a shuttlepod unattractive.
After Sim has undergone the procedure, and after Trip has been
rejuvenated, the final sequence occurs: Archer honors Sim's
sacrifice in the presence of part of the crew (including Trip), and
Sim's body is ejected into space.