Neil Patrick Harris
— Arnold Mosk
Matthew Lillard
— Doug Van Housen
Gabriel Olds
— Gary Trancer
Catherine Hicks
— Mrs. Mosk
Stephen Pearlman
— Principal Jones
Ryan Payne Bell
— Pink
Lori Heuring
— Shelly
Eddie Malavarca
— Porky
Amanda Peet
— Debbie
Dechen Thurman
— Hinge
Brian Vincent
— Eddie LeMaster
Joseph Siravo
— Dr. Rankin
Tina Krause
— Acid Woman in Black
John Paul Fedele
— Spring Heeled Jack
J.J. North
— Acid Woman in White
Frank Vincent
— Arcade Owner
Peggy Gormley
— Jones' Secretary
Huckleberry Fox
— Baldy
Pamela Kramer
— Teacher 1
John Digaletos
— Teacher 2
Madison Arnold
— Older Guard
Paula Stevens
— Teacher 3
Scott MacCann
— Gary's Friend
Stephen Payne
— Classroom Guard / Lesson Giver
Paul Fremder
— Classroom Guard
Judith Singer
— School Secretary
Susan Singer
— Mother
Torri Singer
— Torri
Doug DeLuca
— Gary's Teammate
Scott Hathaway
— Guitar Player