Star Trek, #29-Operation-Annihilate! (Paramount, 1985, Betamax).

"Operation-Annihilate!" is the twenty-ninth and final episode of the first season of the American science fiction television series Star Trek. Written by Stephen W. Carabatsos and directed by Herschel Daugherty, it was first broadcast April 13, 1967.

In the episode, the crew of the Enterprise must find a way to exterminate behavior-altering parasites that have taken over the bodies of residents of a Federation colony, including Captain Kirk's brother, Sam, and family.