A powerful alien who had been the god Apollo of ancient Greece and who tried to make the Enterprise crew his worshippers on Pollux IV.
Apollo is the last of a group of powerful beings who visited Earth thousands of years ago and were worshipped as the gods of ancient Greece. Living on Pollux IV, he seizes the Enterprise with an enormous hand of energy and demands that the crew live on his world and worship him.
He falls in love with Lieutenant Carolyn Palamas, but at Kirk's urging she rejects him. When the crew destroy the temple that is the source of his power, Apollo spreads himself upon the wind and fades away. He was played by Michael Forest.