Who Mourns for Adonais?

In the vicinity of planet Pollux IV, the Enterprise encounters a huge, green hand that materializes in space and holds the starship motionless. The "hand" is not flesh and blood, but a form of energy belonging to a humanoid figure who identifies himself as the god Apollo, last survivor of the band of space travelers who visited old Earth and dwelt on Mount Olympus. He declares the Enterprise crew to be his "children," who will now stay on Pollux IV and worship him. When Mr. Scott objects to the attention Apollo shows to Lieutenant Carolyn Palamas, he is hurled through the air by a thunderbolt from Apollo's hand. The "god" also demonstrates other abilities, including the power to grow to giant size at will. Kirk orders Lieutenant Palamas, who has fallen in love with Apollo, to reject him. Then, using the Enterprise's phasers, he destroys Apollo's temple, the source of the entity's abilities. Seeing that he has lost both his worshipers and his love, Apollo discontinues his physical existence to join his fellow gods.