Andrew Lawrence as Will Browning / Twoie

Mark L. Taylor as Dad

Lori Hallier as Mom

Alison Pill as Allana Browning

Brenden Jefferson as Chuckie

Joe Grifasi as Conrad

Sarah Gadon as Heather

Tyler Hynes as Scottie DeSota

Scott McCord as Victor

Robert Buck as Grandpa Mordechai

Andrea Garnett as Miss Pinkerson

Joseph Motiki as VJ

Colm Magner as Policeman

Paul A. MacFarlane as Bus Driver (as Paul MacFarlane)

Ayumi Iizuka as Gym Teacher (as Ayumi Izuka)

Johnathan Fernandez as Boom Box Student

Joe Matheson as Televangelist

Colleen Reynolds as Contestant

Tiffany Deriveau as Fiona

Olivia Garratt as Harmony

Jared Durand as Will/Twoie Double

Kara Bassil as Cheerleader

Michael Belisaro as Jock

Jane Cooke as Bored Assistant

Sarah Francis as Dancer #1

Daniel Celebre as Dancer #2

Jesse Weafer as Dancer #3

Kristin Ferlisi as Dancer #4 (as Kristen Ferlisi)

Romina D'Ugo as Dancer #4

Josh Feldman as Dancer #6

Bianca Mior as Dancer #7

Jessica Keeling as Dancer #8

Shane Simpson as Dancer #9

Wilson Wong as Music Video Dancer #1

Devon Perri as Music Video Dancer #2

Chad McFadden as Music Video Dancer #3