Three years after the zombie virus has gutted the country, a team of everyday heroes must transport the only known survivor of the plague from New York to California, where the last functioning viral lab waits for his blood.
When the prehistoric warm-water beast the Crocosaurus crosses paths with that cold-water monster the Mega Shark, all hell breaks loose in the oceans as the world's top scientists explore every option to halt the aquatic frenzy. Swallowing everything in their paths -- including a submarine or two -- Croc and Mega lead an explorer and an oceanographer on a wild chase. Eventually, the desperate men turn to a volcano for aid.
A rock concert awakens the legendary monster, who goes on a rampage. The event's organizer plans to kill the beast and create a tourist attraction around its stuffed body, but an environmentalist realizes the creature is the last of its species, and is determined to make sure it does not become extinct.
