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Steve Drexel, William Belmont and Professor Carmichale are sailing by a deserted South Seas island when Belmont bets Steve that he could not survive alone on the island like Robinson Crusoe. Steve agrees to the bet, jumps overboard with his dog and swims ashore. He is immediately industrious, finding fresh water and food, and making tools to build a home with all the conveniences of a Park Avenue apartment. After a month, Steve has built every possible convenience, including animal traps, a home on stilts and various pulleys for transportation. Meanwhile, his friends have continued to Sumatra for a successful tiger hunt. When a native canoes over from a neighboring island, Steve initiates him as his "Man Friday." Finding radio tubes hung around Friday's neck, Steve ingeniously builds a radio. From the same neighboring island, a young bride-to-be escapes from her wedding and canoes to Steve's island. Steve adopts her and names her Saturday, after which Friday leaves. As Steve teaches Saturday rudimentary English, Belmont goes to the neighboring island and instructs the natives to descend on Steve's island and scare him so he can win the bet. One of the natives is Saturday's ex-fiancé, and when he recognizes her, the farce becomes a real fight and Steve must outwit hundreds of natives. After his friends return to their yacht, Steve leads the natives on a chase until he is able to catapult himself to the yacht. Once safely aboard, they discover Saturday has stowed away. Back in New York, Steve watches Saturday perform a native dance for the Ziegfeld Follies.