Before leaving their planet, the Robinsons meet a boy alien called J-5. They take him with them to return him to his home planet. They meet a strange ship, which turns out to be an earth "lighthouse" for lost ships. Thinking this ship will help them with extra fuel and star charts they celebrate, however when J-5 learns that they don't have enough fuel to take him home, he angrily sets about to destroy them all with a creation of his imagination. J-5 begins a new life at the lighthouse, and the Robinson's leave in the knowledge he will be looked after by the kindly, old lighthousekeeper.
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