As chainsaw-wielding Fin arrives in Washington D.C. for a ceremony in his honor, a mass of sharknadoes appears, forcing Fin to spring into action once more. When Fin learns the sharknadoes are not just threatening the Capitol, but the entire Eastern Seaboard, he races down the coast to save his daughter, in Florida for spring break. But as the storms grow even bigger, Fin must stop the colossal, unrelenting sharknadoes before the entire Eastern Seaboard is swept up and chomped into oblivion.