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Although John (Guy Williams) has warned his son Will (Bill Mumy) to stay away from the matter-transfer "maser beam" left behind by the Taurons in the earlier episode "The Sky is Falling", Will activates the device to keep Dr. Smith (Jonathan Harris) from messing with it. Instantly, the beam transports Will all the way back to earth, where in addition to searching for some much-needed carbon tetrachloride to help repair the Robinsons' ship, the boy also attempts to tell the citizens of a rural community who he is and where he comes from. But the locals don't believe his story--after all, weren't the Robinsons supposed to have perished in space?--and prepare to pack Will off to an orphan asylum. Featured in the cast is Sheila Matthews, the wife of Lost in Space producer Irwin Allen.