Ten years after the end of the war in Vietnam, four ex-Marines decide to return to S.E. Asia to investigate reports of American POWs still being held there. These four include Roger, whose daughter's just been married, the unemplo...

When a female rock band uses an infamous old piece of sheet music to record their new album in an old mansion, they accidentally open a portal to hell.

A group of environmentalists arrives at a faraway tropical delta where toxic waste is being dumped. However the water also hides a giant crocodile. The corrupt local officials don't help much either.

The Caribbean swamps which is to be made into a holiday resort is terrorized again by a second monstrous crocodile which is killing off anyone unfortunate to be on the water.