A baby alligator is flushed down a Chicago toilet and survives by eating discarded lab rats, injected with growth hormones. The now gigantic animal, escapes the city sewers, and goes on a rampage, pursued by a cop and a big-game hunter.

When the White House (Secret Service Code: “Olympus”) is captured by a terrorist mastermind and the President is kidnapped, disgraced former Presidential guard Mike Banning finds himself trapped within the building. As the national security team scrambles to respond, they are forced to rely on Banning’s inside knowledge to help retake the White House, save the President and avert an even bigger disaster.