It is New Years Eve, and over 2,000 passengers & crew are ringing in the New Year aboard the huge cruise ship Poseidon on the open sea. At midnight, without warning, a huge wave hundreds of feet high - a rogue wave - slams into the Poseidon and rolls it upside down. Most of the passengers & crew are killed outright, but several hundred remain alive in the ballroom, where the party was being held. Realizing their only hope of rescue lies at the surface of the water - where the ships hull is now - a handful of survivors, led by Dylan (Lucas) and Robert (Russell) start to make their way past falling debris, flash fires, and the ever-present threat of flooding - to the ships propeller shafts. Will they succeed - or will they join the hundreds left behind who perished as the ballrooms windows gave way under the water pressure & drowned?