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Prof. John Robinson (Guy Williams) and family have been launched into the cosmos aboard The Jupiter 2 as volunteers in America's efforts to colonize deep space. However, foreign spy and saboteur Dr. Zachary Smith (Jonathan Harris) manages to throw the ship off course while becoming stuck aboard the vessel himself. The intrepid travelers now have no choice but to brave the unknowns of outer space and strange planets in a struggle for survival.
Did you know?
The robot cost $75,000 to produce and weighed in excess of 200 pounds. Two of them were made for the series. The robot's chest lights and motorized feelers were powered by an electrical cord which can occasionally be spotted. In some scenes where the robot is seen in close-up, only the top of the robot is worn by the actor.