Jeff Cohen
Lawrence "Chunk" Cohen
Corey Feldman
Clark "Mouth" Devereaux
Kerri Green
Andy Carmichael
Martha Plimpton
Stephanie "Stef" Steinbrenner
Ke Huy Quan
Richard "Data" Wang
Joe Pantoliano
Francis Fratelli
Mary Ellen Trainor
Mrs. Walsh
George Robotham
Prison Guard
Charles McDaniel
Chunk's Father
Elaine Cohen McMahon
Chunk's Mother
Michael Paul Chan
Data's Father
George Nicholas McLean
Mouth's Father
Jeb Stuart Adams
Troy's Friend #1
Eric Briant Wells
Troy's Friend #2
Gene Ross
Man in Shower #1
Max Segar
Man in Shower #2
Newt Arnold
Man in Shower #3
Patrick Cameron
Reporter #2
Orwin C. Harvey
Tennis Player
Richard Donner
Policeman (uncredited)
Eydie Faye
Eydie - Chunk's Older Sister (uncredited)
Rick Kuhn
Parent #3 (uncredited)
Cyndi Lauper
Cyndi Lauper (archive footage)
Jennie Lew Tugend
Mrs. Wang (uncredited)
Lisa Quan
Data's Sister (uncredited)
Curt Hanson
Mr. Perkins (as Curtis Hanson)