The Robinsons, Earth's first family of outer space, head to colonize Alpha Centauri in their flying saucer, the Gemini 12, but crash land on an uncharted planet where they deal with its challenges and dangers.
| Actor | Role |
|---|---|
 June LockhartDr. Maureen Robinson | Dr. Maureen Robinson |
 Guy WilliamsDr John Robinson | Dr John Robinson |
 Mark GoddardDr. Don West | Dr. Don West |
 Marta KristenJudy Robinson | Judy Robinson |
 Bill MumyWill Robinson | Will Robinson |
 Angela CartwrightPenny Robinson | Penny Robinson |
| DDon ForbesTV Commentator | TV Commentator |
| LLamar LundyThe Giant | The Giant |
| RRobert 'Big Buck' MaffeiGiant Cyclops | Giant Cyclops |
 Ford RaineyThe President | The President |
 Dick TufeldNarrator | Narrator |
| PPaul ZastupnevichBearded Foreign Correspondent | Bearded Foreign Correspondent |