Plain Clothes (1988)

To prove his brother's innocence, undercover officer Nick enrolls in high school again, dealing with crushes, bullies, humiliations, popularity swings, and quirky teachers and staff to find the real murderer.

Director: Martha Coolidge

Cast: Arliss Howard, Suzy Amis, George Wendt, Diane Ladd, Seymour Cassel, Larry Pine, Jackie Gayle, Abe Vigoda