Matthew Lawrence as Frank Stein

Justin Walker as Lance Kipple

Ryan Reynolds as Karl O'Reilly

Christine Lakin as Macy

Christian Payne as Tuttle

Shelley Duvall as Mrs. Stein

Richard Moll as Mr. O'Reilly

Charles Fleischer as Mr. Stockton

Kenn Michael as Jordy

Bianca Lawson as Darien Stompanato

Judge Reinhold as Mr. Stein

Nicole Nieth as Andrea Shrelonzky

Bradley Jay Lesley as Arnie

Eric Siegel as Officer Scott

Richard Speight Jr. as Comic Book Salesman