Platinum High School (1960)

At an exclusive military academy on Sabre Island (played by Catalina Island), rich young delinquents think money puts them above the law. Enter Steve Conway (Mickey Rooney) - there to investigate the death of his son, who he had been told died in an accident. The Mick(ey Rooney, that is) finds himself quickly in 5 feet of trouble (over his eyebrows), when he's met with hostility by the school's commandant, Major Redfern Kelly (Dan Duryea), and the latter's sweetheart-secretary, Jennifer Evans (Terry Moore); intimidated by the cadet drill instructor, Vince Perley (Christopher Dark), and the P.E. instructor, Hack Marlow (Richard Jaeckel). Attempts are made on his life by a trio of cadets, known collectively as "the 3 beasts", and he's trapped in a 3-against-1 fight with rifles, Just to keep him tested, there's a big speedboat vs. small motor boat (Rooney's craft of course) chase through shark-infested waters. This happens right after he makes a startling discovery when he talks to his son's former roommate, 'Chip' Hastings (Warren Berlinger). The film was released in 1964 as Trouble At Sixteen, by Cinema Associates as part of a double-bill with Girls Town (1959) (now called The Innocent and the Damned, a rather descriptive title; considering the cast).