Steve is turned into a raving paranoid by exposure to mushroom spores, and cuts a deal with Inspector Kobick to betray his crewmates.
The Giants have invented a detector that can home in on a unique Earth-based metal. Dan puts the entire group at risk due to the surgical pin in his leg, and they mus turn to a former ally, Dr. Brule, for help in removing it.
Two giant scientists perform cloning experiments on the Earthlings.
The Earthlings must play a giant-sized game of chess against a demented industrialist... who uses his prisoners as pieces on a board rigged with booby traps.
The Spindrift crashes on the Land of the Giants and its crew and passengers quickly find themselves in a struggle for survival.
The Earthlings come to the aid of a giant deaf boy and his poverty-stricken family.
The Earthlings become involved in an underground resistance in the giant civilization.
The Spindrift crew finds a paranoid survivor from Earth...but his suspicions endanger everyone.