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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.
S2, EP11 "West of Mars"
An outer-space gunfighter who looks exactly like Smith forces the doctor to switch places with him.
S1, EP18 "The Sky Pirate"
A rough-edged visitor (Albert Salmi) swears Will into the brotherhood of pirates.
S1, EP19 "Ghost in Space"
Dr. Smith insists the turbulent "ghost" threatening the Robinson colony is the troubled spirit of his uncle.
S1, EP20 "The War of the Robots"
Restored by Will to full operation, an alien automaton proves superior to the Robinsons' robot.
S1, EP17 "The Keeper"
The Keeper threatens to let his collection of specimens run loose on the planet unless Will and Penny are handed over as specimens.
S1, EP16 "The Keeper"
An alien zoo-keeper (Michael Rennie) threatens to add Penny and Will to his collection.
S1, EP15 "Return From Outer Space"
Will uses the matter-transfer unit to return to Earth, but no one there believes his story.