A near-collision with a comet drains Jupiter 2's fuel, forcing it to dock with a prison ship.
The Robinsons are mistaken for aliens after they pass through a time warp and land on 1947 Earth.
The Robot must fill in as a surgeon to save the life of an alien leader.
A hunter (Vincent Beck) garnering points considers John a prized quarry.
A mammoth computer and a primitive tribe try to prevent the crew from capping a volcano.
Smith discovers a machine that manufactures robots and plans to conquer the galaxy.
A young alien who says he is part of a lost colony asks Penny to help him return to his people.
Will, Smith and the Robot land on a lush planet and appear to be in the future.
Aliens plan to destroy the Robinsons' planet because it will soon collide with their world.
A blue mist envelops the ship, and a wish from Will makes everyone disappear.
An evil mechanism captivates the Robot and plans to use it in her conquests.
A space showman snatches most of the Robinsons for his interplanetary zoo.
Four thieving monsters assume human form and take advantage of Smith's hospitality.
The Robot must fight to protect an ice princess from a fierce bandit.
John's evil counterpart from an anti-matter universe tries to usurp his place in the family.
Aliens make duplicates of the Robinson party to pilot Jupiter 2 and conquer the Earth.
A space captain seeking a long-lost princess thinks Penny is the real thing; guest Arte Johnson.
The Robinsons' lives may be forfeit when Smith uses a time-merchant's machine to return to Earth.
The Jupiter 2 lands on a world populated entirely by young people.
An escaped prisoner (Michael Conrad) frames Smith and Don, who are arrested and jailed.
A mysterious sponsor wants Judy to enter a galactic beauty contest.
Radiation causes an orange tree to run amok and take over the ship.
Smith picks flowers on a planet with intelligent vegetation.
A junk dealer snares the robot, then wants to buy Jupiter 2.
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