In the year 1997, Earth is suffering from massive overpopulation. Professor John Robinson, his wife Maureen, their children (Judy, Penny and Will) and Major Don West are selected to go to the third planet in the Alpha Centauri star system to establish a colony so that other Earth people can settle there. They are to go there on a ship of Professor Robinson's design, christened the Jupiter 2. However, Doctor Zachary Smith, an agent for an enemy government is sent to sabotage the mission. He is successful in reprogramming the ship's robot, but in the process becomes trapped on the ship, and because of his excess weight, the ship and all onboard become hoplessly lost and it now becomes a fight for survival as the crew tries to find their way back home.
Episode List:
* 46: The Questing Beast
* 47: The Toymaker
* 48: Mutiny in Space
* 49: The Space Vikings
* 50: Rocket to Earth
* 51: The Cave of the Wizards
* 52: Treasures of the Lost Planet
* 53: Revolt of the Androids
* 54: The Colonists
* 55: Trip Through the Robot
* 56: The Phantom Family
* 57: The Mechanical Men
* 58: The Astral Traveler
* 59: The Galaxy Gift
