The Earthlings become involved with twin brothers who are plotting to take over the planet.
Using a device stolen from time-travelling researchers, Steve and Dan return to the day of the Spindrift's launch and try to alter history and stop the ill-fated flight.
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.
A sadistic child unleashes his mechanical toys on the hapless Earthlings.
The Earthlings become involved in a sabotage scheme to destroy the nearby city.
Mark is framed for the murder of two Giants and begins acting suspiciously, turning his crewmates against him.
A friendly Giant has a teleport device that can send the Spindrift crew back to Earth, but the SID use the whole thing as a trap.
The Earthlings become involved in the politics of a secret underground city.
An alien piper, claiming to be the Pied Piper of Hamlin, brings his act to the Land of the Giants.
While working with a helpful Giant scientist, the Earthlings are subjected to radiation which causes strange hallucinations.
The Earthlings become involved with a superstitious Irish Giant who believes they're leprechauns.
Fitzhugh and Steve accidentally return to Earth in a space-time pod but end up in 1900 and must deal with hostile villagers.
Barry and Valerie are carried off in a balloon to a distant land ruled by a malevolent dictator.
Two time travelers from 5477 come to the Land of the Giants to conquer Earth.
A giant scientist performs cloning experiments on the Earthlings.
The Spindrift come to the aid of a has-been horror actor but during his comeback movie they find themselves in danger from his enthusiastic director.
Fitzhugh is captured by the owner of a wax museum who is involved in a stolen-diamond racket.
When Chipper is injured by a giant dog, Barry and the others must turn to a giant veterinarian and his sadistic son for assistance.
Valerie is forced to act as a toy ballerina in a giant's scheme to kill his rich uncle.
The Earthlings aid a giant trumpet player against crooks.
Steve is turned into a raving paranoid by exposure to mushroom spores, and cuts a deal with Inspector Kobick to betray his crewmates.
The Earthlings must play a game of real-life chess with a demented giant industrialist.
Fitzhugh tries to use his gambling expertise to pick the winners at a local racetrack, but has to enter into a deal with a giant to do so.
The Earthlings come to the aid of a convicted criminal who has been falsely accused.
The Earthlings become involved in a scientist's scheme to build an indestructible android.
