Plot: At midnight on New Year's Eve, the SS Poseidon is struck by a 90-foot tidal wave and is capsized. Reverend Frank Scott leads nine survivors; an elderly couple, Manny and Belle Rosen headed to Israel to see their grandson; A New York detective and his ex-prostitute wife, Mike and Linda Rogo on their second honeymoon to Italy; A young brother and sister, Robin and Susan Shelby going to meet their parents in Greece; A haberdasher James Martin; a pop singer Nonnie Parry, and a waiter from the ship Acres. They travel from the grand ballroom struggling through, steam, fire and rising water in the upside-down ship to reach the bottom (the propeller shaft), now the top.
Alternative Plot: En route from New York City to Greece on New Year's Eve, majestic passenger ship the S.S. Poseidon is overtaken by a tidal wave. With the captain (Leslie Nielsen) dead, surviving passengers, including the passionate Rev. Scott (Gene Hackman), band together in the ship's ballroom. The group struggles to avert fires, flooding, structural instability and mechanical malfunctions as they make their way through a maze of ladders and tunnels in their desperate attempt to escape a watery grave.
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