While in the Space Pod, the bumbling Dr. Smith accidentally launches himself, Will and the Robot to a nearby planet, where they are startled to discover invisible birds, an apparent wreck of the Jupiter 2, and a monument honoring the Robot.
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The never-helpful Dr. Smith accidentally launches the Space Pod into space while the lower half of the Robot is on board! Will he and the Robinsons retrieve it and put their beloved helpmate back together again?
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Trying to escape from a flaming comet, the Robinsons come upon a spaceship filled with frozen alien criminals. Havoc ensues when the ever-meddlesome Dr. Smith thaws one of the aliens who then frees the others.
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Caught in a “time warp,” the Jupiter 2 crew discover not only that they can now return to Earth, but it’s suddenly 1947! Mistaken for Martians by fearful 1940s Earth-dwellers, The Robinsons realize they must find a way back to their future!
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John Robinson is accidentally transported to an anti-matter world, where he is held captive by an evil replica of Don. Meanwhile, an “evil” John Robinson shows up at the Jupiter 2 and poses as the real John.
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Penny is captured and taken to an intergalactic zoo, where she is expected to be part of a show, along with the rest of her family. Meanwhile, Dr. Smith tries to take over the zoo.
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The Robinsons take in a princess who is being sought by a bounty hunter. Then, Will gets captured by the bounty hunter, who now wants to trade Will for the princess. Eventually, it is the Robot who comes up with unusual rescue plan.
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Dr. Smith picks a flower and is immediately accused of murder by a giant talking carrot, who says that he must now die! Naturally, Dr. Smith doesn’t reveal this to the others, enhancing the chaos when plants mysteriously start stalking the crew!
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Once welcomed to do so, the Jupiter 2 arrives on a planet inside the Alpha Centauri solar system. But soon after landing, the Robinsons must rescue Will and Penny, who are taken captive by the planet’s 14-year-old leader.
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An alien prison escapee manages to exchange his prison jacket for Dr. Smith’s parka. Mistaken for the criminal, Smith is then arrested, but thinking quickly, he tells the authorities that he is not their man – Don is!
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The Robinson family (without the later-to-be-added Robot B-9 and Dr. Smith characters) rockets into outer space, only to crash-land onto a desert planet.
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