A woman believes herself to be the reincarnated spirit of an ancient prince's lover. Meanwhile, a murderer turns out to be the reincarnated spirit of the prince himself.

An aborted mission strands a crew on Venus where they find the planet inhabited only by women led by their evil Queen Yllana. Yllana had all the men of Venus killed, now that's she met Earth men, she wants them dead, too.

A team of American astronauts leave their space station on the first mission to Mars, but the captain's religious beliefs may get in the way.