Drs. Nathan and Marla Collins are shark experts working on a top-secret government project: to protect our shorelines by creating controlled shark patrols. When their project is sabotaged, the mutant great white sharks are released into American waterways. Out among the general population the smartest of the sharks, Red Dog, carries a neutron bomb on a mission to blow up the Golden Gate Bridge. MPAA Rating: PG-13 Rated PG-13 for some action violence and brief strong language.