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.
| Title | Time | |
|---|---|---|
| 1 | The Crash | 1968-09-22 |
| 2 | Ghost Town | 1968-09-29 |
| 3 | Framed | 1968-10-06 |
| 4 | Underground | 1968-10-20 |
| 5 | Terror-Go-Round | 1968-11-03 |
| 6 | The Flight Plan | 1968-11-10 |
| 7 | Manhunt | 1968-11-17 |
| 8 | The Trap | 1968-11-24 |
| 9 | The Creed | 1968-12-01 |
| 10 | Double-Cross | 1968-12-08 |
| 11 | The Weird World | 1968-12-22 |
| 12 | The Golden Cage | 1968-12-29 |
| 13 | The Lost Ones | 1969-01-05 |
| 14 | Brainwash | 1969-01-12 |
| 15 | The Bounty Hunter | 1969-01-19 |
| 16 | On a Clear Night You Can See Earth | 1969-01-26 |
| 17 | Deadly Lodestone | 1969-02-02 |
| 18 | Night of Thrombeldinbar | 1969-02-16 |
| 19 | Seven Little Indians | 1969-02-23 |
| 20 | Target: Earth | 1969-03-02 |
| 21 | Genius at Work | 1969-03-09 |
| 22 | Return of Inidu | 1969-03-16 |
| 23 | Rescue | 1969-03-23 |
| 24 | Sabotage | 1969-03-30 |
| 25 | Shell Game | 1969-04-13 |
| 26 | The Chase | 1969-04-20 |