Star Trek, #45-A Private Little War (Paramount, 1986, Betamax).

"A Private Little War" is the nineteenth episode of the second season of the American science fiction television series Star Trek. Written by Gene Roddenberry, based on a story by Don Ingalls (under the pseudonym Jud Crucis), and directed by Marc Daniels, it was first broadcast on February 2, 1968.

In the episode, the crew of the Enterprise discovers Klingon interference in the development of a formerly peaceful planet and joins them in what becomes an arms race.