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The Robinson family was supposed to set off on a five-year mission to explore a distant planet, but an act of sabotage by the scheming Dr. Zachary Smith -- who managed to get himself trapped aboard the spaceship -- leaves them adrift in space for three years. The Robinsons, pilot Don West, Dr. Smith and their trusty robot move from planet to planet, always searching for a way to return to Earth.
S3, EP18 "The Time Merchant"
The Robinsons' lives may be forfeit when Smith uses a time-merchant's machine to return to Earth.
S3, EP17 "Princess of Space"
A space captain seeking a long-lost princess thinks Penny is the real thing; guest Arte Johnson.
S3, EP19 "The Promised Planet"
The Jupiter 2 lands on a world populated entirely by young people.
S3, EP23 "The Great Vegetable Rebellion"
Landing on a planet lush with vegetation, the Jupiter falls into the clutches of a carrot monster.
S3, EP22 "The Flaming Planet"
Radiation causes an orange tree to run amok and take over the ship.
