The Earthlings come to the aid of a giant deaf boy and his poverty-stricken family.
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.
The Spindrift crew finds a paranoid survivor from Earth...but his suspicions endanger everyone.
An amnesiac Fitzhugh falls in with two giant thieves and becomes their willing accomplice.
The Earthlings become involved in an underground resistance in the giant civilization.
The Spindrift crashes on the Land of the Giants and its crew and passengers quickly find themselves in a struggle for survival.