THE SUBSTITUTE opens. Directed by Robert Mandel. Written by Roy Frumkes, Rocco Simonelli and Alan Ormsby. Tom Berenger oozes coiled menace as ex mercenary working undercover as substitute teacher in gang and drug infested Miami school. Effectively exploitative, guiltily entertaining addition to Blackboard Jungle sub-genre co-starring Ernie Hudson, Diane Venora and Marc Anthony.