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Buster Crabbe is a doctor, accompanying a shipment of fever serum to a remote jungle village. The ship is torpedoed by a U-Boat. Crabbe and his girlfriend Sheila D'Arcy are marooned on a small island. When D'Arcy falls ill to jungle fever, Crabbe heroically dives into the ocean to retrieve the serum. Its adventure quotient aside, Jungle Man has all the production expertise of an 8-millimeter home movie.