Two escaped convicts are found hiding in a rocket ship built by a renegade inventor, who forces them to become the crew for a trip to the Moon. Also on board, as inadvertent stowaways, are his assistant and his secretary; and none of them are aware that the inventor is actually a Lunarian explorer sent to Earth by the dying Lunar civilization.

Tom Collier has had a great relationship with Daisy, but when he decides to marry, it is not Daisy whom he asks, it is Cecelia.

When Dr. Frankenstein decides to retire from the monster-making business, he calls an international roster of monsters to a creepy convention to elect his successor.