Two on a Raft
S1E1
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Gilligan's Island S01E19 · Gilligan Meets Jungle Boy
S1E196th February 196525m5.7(3)
Gilligan discovers a jungle boy living on the island. He shows them a hole in the ground that causes objects to float, and the professor theorizes that it is expelling either helium or hydrogen. He immediately sets to work building a large balloon, with the hopes of carrying one of them back to civilization.