Nick Cannon stars in this comedy thriller as a 24-year-old police detective who takes no small amount of ribbing from his fellow officers for his boyish looks. His appearance, however, lands him a plumb assignment at a posh private high school, where he discovers the students are operating an underground business stealing and selling luxury cars. The Underclassman also stars Cheech Marin, Roselyn Sanchez, and Kelly Hu. ~ Mark Deming, All Movie Guide