When a mysterious caller plants a bomb under his car seat, a bank executive begins a high-speed chase across the city to complete a specific series of tasks — all with his kids trapped in the back seat.

French nuclear tests irradiate an iguana into a giant monster that viciously attacks freighter ships in the Pacific Ocean. A team of experts, including Niko Tatopoulos, conclude that the oversized reptile is the culprit. Before long, the giant lizard is loose in Manhattan as the US military races to destroy the monster before it reproduces and it's spawn takes over the world.