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

Mark falls for an attractive Earth girl - the survivor of a previous space flight.

Barry is strick by appendicitis and the Earthlings have no choice but to turn to a giant doctor for assistance.

The Spindrift crew finds a paranoid survivor from Earth...but his suspicions endanger everyone.

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.

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

The Earthlings come to the aid of a giant deaf boy and his poverty-stricken family.

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

The Earthlings find themselves trapped in an Earth-sized town run by a giant eccentric and his sadistic daughter.

The Earthlings become involved in an underground resistance in the giant civilization.

The Giants have invented a chemical that forces those exposed to it to tell the truth, and plan to test it on the Earthlings.

The Earthlings become involved with an insane giant scientist who has infra-red goggles he can use to find them whenever he wants.

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.

When a giant hobo is framed for murder, the Earthlings come to his aid.

The Spindrift crew find an amnesiac Earthling, Joe, but it turns out to be a ploy by giant crooks to get hold of the ship's power supply.

An amnesiac Fitzhugh falls in with two giant thieves and becomes their willing accomplice.

The Spindrift crew must deal with the head of Police Security, who is attempting to undermine a Senator who believes in their cause and frame the Earthlings for sabotage.

The Spindrift crashes on the Land of the Giants and its crew and passengers quickly find themselves in a struggle for survival.

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

A giant escaping convict takes the Spindrift but then wanders into quicksand, endangering everyone.

When the giants increase their search efforts, the Earthlings must increase their salvage efforts and end up captured by a giant and his daughter.

The Earthlings come to the aid of a giant magician.

Barry and Fitzhugh are captured by giant Gypsies.

The Earthlings try to salvage radium from a clock but find themselves at the mercy of giant scientists using a sound detector to home in on them.