10 Most Messed Up Deaths In Star Trek: Enterprise
2. Killed To Harvest Their Organs - Similitude
Similitude works so well because we the audience truly care about Trip Tucker. One might then question why we should feel so strongly about the manner of another character's exit - but that, of course, is the brilliance of Conner Trinneer's performance as the character in question.
Sim is a clone of the Floridian engineer, created for a single purpose: they're going to Never Let Me Go him, saving their engineer, but killing the clone in the process. It's a stark reality of the third season of Star Trek: Enterprise. No one is expendable - provided they have a critical role to play. Sim certainly had a critical role - it was just a finite one.
Hearing the man plead for his life evokes memories of Tuvix, which may in fact have been the writers' intentions, but his acceptance is just as crushing. There is no hope for Sim - he is doomed, if not by Phlox's hand, then by Phlox's design. Without a treatment to stop the rapid ageing, he will age and die in a manner of weeks - resulting in both his, and Trip's, deaths.
With this and Velton Ray Bunch's haunting score, Similitude is a difficult watch. We understand why this has to happen, but it feels so brutal to sit through. Sim may want to live, but the cost outweighs the will.