Frank Overton played Elias Sandoval, the leader of the agricultural colony on Omicron Ceti III whose settlers are kept alive and contented by alien spores, in This Side of Paradise.
Frank Overton (1918–1967) was a respected American character actor whose films included To Kill a Mockingbird and Fail Safe. His appearance in This Side of Paradise was among his last roles; he died a few weeks after the episode was first shown.
Sandoval greets the Enterprise landing party, which had expected to find the colonists dead from Berthold radiation. He is placid and evasive, and it emerges that the settlers are protected by spores that also remove all ambition.
Once Kirk frees the crew by provoking strong emotion, Sandoval is shaken out of the spores' influence. He recognises that the colony has achieved nothing in three years and asks to be relocated so that the work can start again.