Two time travellers from 5477 come to the Land of the Giants to conquer Earth.

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 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.

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

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.

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

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

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

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

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

This time around, four punk kids from Earth run up against the Spindrift crew.

Fitzhugh is captured by the owner of a wax museum who is involved in a stolen-diamond racket.

The Earthlings come to the aid of a convicted criminal who has been falsely accused.

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

A sadistic child unleashes his mechanical toys on the hapless Earthlings.

Mark is framed for the murder of two Giants and begins acting suspiciously, turning his crewmates against him.

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.

An alien piper, claiming to be the Pied Piper of Hamlin, brings his act to the Land of the Giants.

The Earthlings become involved with a superstitious Irish Giant who believes they're leprechauns.

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.

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

The Earthlings become involved in the politics of a secret underground city.

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

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

Barry and Fitzhugh are captured by giant Gypsies.

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

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