A scuba diving instructor, her biochemist boyfriend, and her police chief ex-husband try to link a series of bizarre deaths to a mutant strain of piranha fish whose lair is a sunken freighter ship off a Caribbean island resort.
Two feuding brothers (one a policeman, the other a martial arts expert) of different political views, join forces to avenge the death of their father, a retired agent, killed by the mafia.
An advertising firm, desperate to keep an account from a financially-ailing brewery, concocts a macho ad campaign centering on three losers who inadvertently prevent a robbery at a bar.
