American television writer and producer who wrote The Alternative Factor and devised the story of A Private Little War, on which he took the pseudonym Jud Crucis.
Don Ingalls was a writer and producer who had worked with Gene Roddenberry on Have Gun – Will Travel and later produced Fantasy Island.
He wrote two stories for the original Star Trek. The Alternative Factor, from the first season, concerns Lazarus and his double from an antimatter universe, whose meeting would destroy both realities. For the second season he devised A Private Little War, in which Kirk finds the Klingons arming one faction on the planet Neural and decides to arm the hill people of his friend Tyree in turn.
The teleplay of the latter was rewritten by Roddenberry, and Ingalls is credited for the story under the name Jud Crucis.