The SS Poseidon, a trans-Atlantic passenger steamship slated for retirement, is making its way across the Atlantic from New York City to Athens on its last voyage. On the bridge, company representative Linarcos (Fred Sadoff) orders the ship's master, Captain Harrison (Leslie Nielsen), to empty ballast and proceed at full speed, against the Captain's better judgement. Meanwhile, Detective Lieutenant Mike Rogo (Ernest Borgnine) and his ex-prostitute wife Linda (Stella Stevens)--seasick, like much of the passengers--receive an invitation to the captain's table. Reverend Frank Scott (Gene Hackman), a priest questioning his faith, delivers an unnerving sermon at Sunday service. Susan Shelby (Pamela Sue Martin) and her younger brother Robin (Eric Shea) are traveling to meet their parents. Robin is interested in how the ship works and frequently visits the engine room. Retired hardware store owner Manny Rosen (Jack Albertson) and his wife Belle (Shelley Winters) are going to Israel to meet their two-year-old grandson for the first time. Haberdasher James Martin (Red Buttons) is a love-shy, health-conscious bachelor. The ship's singer, Nonnie Parry (Carol Lynley) rehearses for the New Year celebration with her band, which includes her brother Teddy on drums. That evening, New Year's Eve, everybody gathers in the dining room to celebrate. Captain Harrison is called back to the bridge because of an emergency report of an undersea earthquake near Crete. Harrison receives word from the lookout that there is a huge wave heading towards them. He immediately issues a mayday, but it is already too late. The wave hits the bridge, drowning Harrison, Linarcos and other ship's officers. The ship rolls over, killing and injuring most of the people on board.
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