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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.
S1, EP12 "The Raft"
Smith has his own plans for a scaled-down ship the Robinsons are building to launch to Earth.
S2, EP10 "The Curse of Cousin Smith"
Smith's cousin (Henry Jones) arrives and tries to do him in to inherit.
S1, EP13 "One of Our Dogs Is Missing"
A dog, in suspended animation for 20 years, lands on the planet and helps save Judy from a mutant.
S1, EP14 "The Attack of the Monster Plants"
Giant plants first devour the party's fuel supply and then engulf Judy.
S1, EP11 "Wish Upon a Star"
In an empty spaceship, Will finds a machine that grants anyone two wishes a day.
S1, EP10 "The Sky Is Falling"
An inability to communicate hampers relations between the Robinsons and an alien family.
S1, EP9 "The Oasis"
Faced with dying of thirst, the Robinsons find a source of water in a fruit that causes violent growth.