1. The Mechanical Man

The Earthlings become involved in a scientist's scheme to build an indestructible android.

2. Six Hours to Live

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

3. The Inside Rail

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.

4. Deadly Pawn

The Earthlings must play a game of real-life chess with a demented giant industrialist.

5. The Unsuspected

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

6. Giants and All That Jazz

The Earthlings aid a giant trumpet player against crooks.

7. Collector's Item

Valerie is forced to act as a toy ballerina in a giant's scheme to kill his rich uncle.

8. Every Dog Needs a Boy

When Chipper is injured by a giant dog, Barry and the others must turn to a giant veterinarian and his sadistic son for assistance.

9. Chamber of Fear

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

10. Comeback

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.

11. The Clones

A giant scientist performs cloning experiments on the Earthlings.

13. Land of the Lost

Barry and Valerie are carried off in a balloon to a distant land ruled by a malevolent dictator.

14. Home Sweet Home

Fitzhugh and Steve accidentally return to Earth in a space-time pod but end up in 1900 and must deal with hostile villagers.

15. Our Man O'Reilly

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

16. Nightmare

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

17. Pay the Piper

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

18. The Secret City of Limbo

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

19. Panic

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.

20. The Deadly Dart

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

21. Doomsday

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

22. A Small War

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

23. The Marionettes

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.

24. Wild Journey

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.

25. Graveyard of Fools

The Earthlings become involved with twin brothers who are plotting to take over the planet.