A space colony family struggles to survive when a spy/accidental stowaway throws their ship hopelessly off course.
In the year 1997 the Robinson family take off to colonise Alpha Centuri. A spy from a foreign country AKA Dr. Smith becomes trapped aboard trying to sabotage the project. The ship is whisked off course and into a meteor storm due to Dr Smith's extra weigh
In October 1997, 32 years in the future from the perspective of viewers in 1965, the United States is about to launch one of history's great adventures: man's colonization of deep space. The Robinson family, supposedly selected from two million volunteers for this mission, consisted of Professor John Robinson, played by Guy Williams, his wife, Maureen, played by June Lockhart, their children, Judy (Marta Kristen), Penny (Angela Cartwright), and Will (Billy Mumy). They are accompanied by their pilot, U.S. Space Corps Major Donald West (Mark Goddard), who is trained to fly the ship when the time comes for the eventual landing. It turns out that Dr. Zachary Smith (Jonathan Harris), is moonlighting as a secret agent for an unnamed nation. Smith reprograms the Jupiter 2's B-9 environmental control robot, voiced by Dick Tufeld, to destroy critical systems on the spaceship eight hours after launch. Smith becomes trapped aboard at launch and his extra weight throws the Jupiter 2 off course, causing it to encounter a meteor storm. This, plus the robot's rampage which causes the ship to prematurely engage its hyperdrive, causes the expedition to become hopelessly lost in the infinite depths of outer space. The Robinsons are regularly placed in danger by Smith, whose selfish actions and laziness endanger the family frequently. After the first half of the first season, Smith's role assumes less sinister overtones, although he continues to display many character flaws. In "The Time Merchant" Smith shows he actually does care about the Robinsons, when he travels back in time to the day of the Jupiter 2 launch, with the hope of changing his own fate by not boarding the ship, so allowing the Robinsons to start the mission as originally planned. However, he learns that without his weight altering the ship's course, the Jupiter 2 will be destroyed by an uncharted asteroid. So he sacrifices his chance to stay on his beloved Earth, electing to re-board the ship, thus saving the lives of the family and continuing his role amongst them as the reluctant stowaway. The fate of the Robinsons, Don West and Dr. Smith is never resolved, as the series unexpected cancellation left the Jupiter 2 and her crew literally on the junk-pile at the end of season three.
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