Star Trek episode "Who Mourns for Adonais?"

"Who Mourns for Adonais?"

Season 2, episode 2.

They meet the Greek god Apollo!

That "What If?" aspect to this episode is cool, the possiblity of an advanced alien race coming to ancient Earth and being seen as gods is extremely intriguing.

In a monotheistic aspect, showing the relation of religion to Star Trek in one sentence, Kirk says to Apollo, "Man has no need of gods--we find the one quite adequate."

On another note, I was thinking during this episode that it would be kind of cool to have some Star Trek omnipotence battle. The Organians, Q, Trelane, the Talosians, these Greek gods, could all vie for power or something. The Enterprise could prevent it all. Might be worth a revisit in a Star Trek novel.