A freak weather system turns its deadly fury on New York City, unleashing a Sharknado on the population and its most cherished, iconic sites - and only Fin and April can save the Big Apple.

Former CIA spy Bob Ho takes on his toughest assignment to date: looking after his girlfriend's three kids, who haven't exactly warmed to their mom's beau. And when one of the youngsters accidentally downloads a top-secret formula, Bob's longtime nemesis, a Russian terrorist, pays a visit to the family.