The California coast is terrorized by two enormous prehistoric sea creatures as they battle each other for supremacy of the sea.
A scientist from the failed Philadelphia Experiment leads a team of Navy SEALs back in time to the Cretaceous Period to rescue the first team he sent back during the 1940s. Things go wildly awry though, when on his return he accidentally brings a giant, man-eating dinosaur back through the portal and into modern-day, downtown Los Angeles.
Shipwrecked castaways stumble upon the mysterious island of Caprona in the Bermuda Triangle, confronting man-eating dinosaurs and a stranded German U-Boat crew while trying to escape.
