3-15 The Moment of Truth (1986)

A tough teen, Jeff (Adam Baldwin) used to be involved with a local gang, the Cobras. Tired of the violence and drugs, Jeff is through with gang life, but when members of his old crew take over the high school, he must decide whether to take on his former buddies or let them run wild. When the Cobras harm Jeff's girlfriend, Sherry (Deborah Foreman), however, his choice is clear, and he sets out to confront the gang's leader after the school bell rings.