When two researchers discover a colossal shark's tooth off the Mexican coast, their worst fears surface: the most menacing beast to ever rule the waters is still alive and mercilessly feeding on anything that crosses its path.

A man with a fear of sharks is forced by a Russian crime syndicate to find sunken treasure in the breeding ground for a shoal of man-eating Great Whites.

A commando of retired US SEALs must invade an island in North Japan from where a rogue ex-SEAL menaces to launch a nuclear strike against the US. Because of a leak of natural gas, fighting is restricted to blade weapons.