Fitzhugh pretends to be an elf to entertain two orphan children, but things turn deadly when it's revealed that traditionally the children sacrifice the elf to make a wish come true.

After the Earthlings are inadvertently responsible for two children becoming trapped in a well, they volunteer their servicse to rescue them.

Inspector Kobick of the SID involves the Earthlings in a plan to track down counterfeiters.

The Earthlings become involved in a scientist's scheme to build an indestructible android.

Steve is turned into a raving paranoid by exposure to mushroom spores, and cuts a deal with Inspector Kobick to betray his crewmates.

A giant scientist performs cloning experiments on the Earthlings.

Fitzhugh and Steve accidentally return to Earth in a space-time pod but end up in 1900 and must deal with hostile villagers.

The Earthlings become involved in the politics of a secret underground city.

Mark is framed for the murder of two Giants and begins acting suspiciously, turning his crewmates against him.

The Earthlings aid an injured puppeteer by pretending to be his dancing puppets, but the owner soon suspects they are involved and prepares to capture them for the reward.