When a commercial airliner is trapped within a ring of erupting volcanoes, the passengers and crew must find a way to survive - without landing.

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.

Volcanic activity awakens a prehistoric giant anaconda, forcing the local Sheriff and a band of volunteers to stop the menace.