A very large shark has been terrorizing the workers trying to install an underwater cable of the coast of Mexico, so a resort security diver, Ben (John Barrowman), takes it upon himself to put a stop to the killing. However, a tooth he finds is identified by researcher Cat Stone (Jennifer McShane) to be from not a shark, but a prehistoric megalodon, thought to be extinct for 24 million years. With a crew of victims -- er, sailors -- they set out to hunt the beast. But little do they know, the big shark attacking their boat and eating their crewmembers are the babies, and their mother is really, really big -- and angry. ~ Buzz McClain, All Movie Guide