
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.

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

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

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

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

Barry and Fitzhugh are captured by giant Gypsies.

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.

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

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.

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

An amnesiac Fitzhugh falls in with two giant thieves and becomes their willing accomplice.
Created by: Irwin Allen
Available on: ABC