 In the near future, earth s fossil resources are about to be used up. In an attempt to save the human race, scientists have begun building a gate, through which faster than light travel will be possible - but only if there is a gate at the destination to receive the travelers. The Robinson Family has been chosen to travel to Alpha Prime - the only other inhabitable planet known - at normal speed, ten years, cryogenically frozen. But Dr. Smith, a sinister man, sabotages their spaceship, Jupiter 2, but is also betrayed by his people. So, he has to work together with the Robinsons in order to survive himself. When Jupiter 2 is falling into the sun, the only chance to survive is to activate the hyperdrive - without a gate at the other end. Soon, the Robinsons are someplace really unknown, where they meet unfriendly silicon-based space spiders, take in a little ape-like creature and name new star systems after Bugs Bunny and Porky Pig. They have to reach Alpha Prime in order to build the second gate, or earth s only hope is gone.