Perry King plays Andrew Norris, the new music teacher who tries to maintain order in a high school terrorized by a violent gang.
Timothy Van Patten portrays Peter Stegman, the menacing and sociopathic leader of the gang of students who cause chaos in the school.
Roddy McDowall appears as Terry Corrigan, a fellow teacher who tries to help Andrew Norris deal with the troubled students.
Michael J. Fox has a role as Arthur, one of the students at the school who gets caught up in the escalating violence.
Merrie Lynn Ross plays Diane Norris, Andrew's wife who becomes increasingly worried about his safety as the situation at the school worsens.
Stefan Arngrim portrays Drugstore, a member of Peter Stegman's gang who is involved in criminal activities at the school.
Keith Knight appears as Barnyard, another member of the gang who participates in the violent and destructive behavior.
Lisa Langlois plays Patsy, a student who becomes a victim of the gang's cruelty and violence.
Neil Clifford appears as Fallon, a troubled student who is influenced by Peter Stegman's dangerous leadership.
Al Waxman portrays Detective Stewiski, a police officer who becomes involved in the investigation of the criminal activities at the school.
Erin Noble plays Deneen, a student who is caught up in the chaos and violence unleashed by Peter Stegman and his gang.
David Gardner appears as Principal Morganthau, the school's principal who struggles to maintain control over the deteriorating situation.
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