Set fifteen years in the then-future year 1983, the series tells the tale of the crew and passengers of a sub-orbital transport ship named Spindrift. In the pilot episode, the Spindrift is en route from Los Angeles to London, on an ultra-fast sub-orbital flight. Just beyond Earth's boundary with space, the Spindrift encounters a magnetic space storm, and is dragged through a space warp to a mysterious planet where everything is twelve times larger than on Earth, whose inhabitants the Earthlings nickname "the Giants". The Spindrift crash-lands, and the damage renders it inoperable.
Episode 1
The Spindrift crashes on the Land of the Giants and its crew and passengers quickly find themselves in a struggle for survival.
Episode 2
The Earthlings find themselves trapped in an Earth-sized town run by a giant eccentric and his sadistic daughter.
Episode 3
When a giant hobo is framed for murder, the Earthlings come to his aid.
Episode 4
The Earthlings become involved in an underground resistance in the giant civilization.
Episode 5
Barry and Fitzhugh are captured by giant Gypsies.
Episode 6
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.
Episode 7
A giant escaping convict takes the Spindrift but then wanders into quicksand, endangering everyone.
Episode 8
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.
Episode 9
Barry is strick by appendicitis and the Earthlings have no choice but to turn to a giant doctor for assistance.
Episode 10
An amnesiac Fitzhugh falls in with two giant thieves and becomes their willing accomplice.
Episode 11
The Spindrift crew finds a paranoid survivor from Earth...but his suspicions endanger everyone.
Episode 12
Mark falls for an attractive Earth girl - the survivor of a previous space flight.
Episode 13
This time around, four punk kids from Earth run up against the Spindrift crew.
Episode 14
The Giants have invented a chemical that forces those exposed to it to tell the truth, and plan to test it on the Earthlings.
Episode 15
When the giants increase their search efforts, the Earthlings must increase their salvage efforts and end up captured by a giant and his daughter.
Episode 16
The Earthlings become involved with an insane giant scientist who has infra-red goggles he can use to find them whenever he wants.
Episode 17
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.
Episode 18
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.
Episode 19
Kobick uses a captured Chipper as bait in a trap to capture the entire Spindrift crew.
Episode 20
Mark is roped into helping two giant scientists build a spaceship that can return them all to Earth.
Episode 21
A giant boy-genius comes up with a pill that can enlarge an Earthling to Giant-size.
Episode 22
The Earthlings come to the aid of a giant magician.
Episode 23
After the Earthlings are inadvertently responsible for two children becoming trapped in a well, they volunteer their servicse to rescue them.
Episode 24
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.
Episode 25
The Earthlings come to the aid of a giant deaf boy and his poverty-stricken family.
Episode 26
Inspector Kobick of the SID involves the Earthlings in a plan to track down counterfeiters.
