Antos IV was the fourth planet of the Antos system, and was the homeworld to a benevolent and peaceful people who cared for Captain Garth of Izar after he suffered an accident. During the 2260s, they taught Garth the art of cellular metamorphosis. (TOS: "Whom Gods Destroy")

Antos IV was also the home to an energy-controlling species known as giant dry-worms. (TOS: "Who Mourns for Adonais?")