The Giants have invented a detector that can home in on Earth-based metals, and Dan puts the entire group at risk due to the surgical pin in his leg.

Kobick uses a captured Chipper as bait in a trap to capture the entire Spindrift crew.

Mark is roped into helping two giant scientists build a spaceship that can return them all to Earth.

A giant boy-genius comes up with a pill that can enlarge an Earthling to Giant-size.

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.

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

While working with a helpful Giant scientist, the Earthlings are subjected to radiation which causes strange hallucinations.

The Earthlings become involved in a sabotage scheme to destroy the nearby city.