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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, EP22 "The Flaming Planet"
Radiation causes an orange tree to run amok and take over the ship.
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, EP16 "Target: Earth"
Aliens make duplicates of the Robinson party to pilot Jupiter 2 and conquer the Earth.
S3, EP13 "Two Weeks in Space"
Four thieving monsters assume human form and take advantage of Smith's hospitality.
