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Accidentally landing on a planet, Will, Doctor Smith and the Robot find the Jupiter 2 is now an archaeological site and that they are in the future.
The Robinsons take a boy home to his planet and come across a spaceship that is a space lighthouse. The boy gets angry when they tell him they don't have enough fuel to get him home.
A group of space hippies is going to destroy the planet the Robinsons are on.