A teenage girl is captured by a giant mutated squid-like creature that appears from Seoul's Han River after toxic waste was dumped in it, prompting her family into a frantic search for her.

Jason ships out aboard a teen-filled "love boat" bound for New York, which he soon transforms into the ultimate voyage of the damned.

Frank and Katrin return to Frankfurt to stop the scientist responsible for unleashing the plague of genetically mutated vermin upon the city.