10 Most Shocking Betrayals In Star Trek

10. Terrell And Checkov - The Wrath Of Khan

Poor Captain Terrell. His crime: being a captain in a film featuring James T. Kirk. He never stood a chance.

Discovered by Khan on Ceti Alpha V, Terrell and Checkov have the very unfortunate luck to be infected by the Ceti Eels and they become slaves to the will of their new master, Khan. The audience sees them participate in the duping of Carol Marcus, threatening to take Genesis.

Khan then attacks the Enterprise but they are conspicuously absent. After the battle, Kirk and crew arrive at Regula 1, discovering the two men in a storage locker. They are revived and the crew hear their tale. They are clearly shell-shocked but they are honest in their recollections, informing Kirk of the whereabouts of the Reliant's crew and the intentions of Khan. As any good Starfleet officer would, Kirk allows them to accompany him in his search for Marcus and Genesis.

Beaming down to the rock below, the sad twist becomes evident. The men had never been freed from Khan's control. They pull their phasers on the landing party, killing the unfortunate (and frankly, un-mourned) Jedda. They inform Khan of the party's location and he beams up Genesis. He then orders them to kill Kirk.

What follows is a quick but sad scene. Terrell overcomes his conditioning and rather than kill a fellow officer, turns the weapon on himself. Checkov holds out long enough for the bug to fall out of his ear. An ignoble end to another captain, but a lesson to all who would try and share centre stage with William Shatner.