James Marsden as Steve Clark

Katie Holmes as Rachel Wagner

Nick Stahl as Gavin Strick

Bruce Greenwood as Dr. Edgar Caldicott

William Sadler as Newberry

Chad Donella as U.V.

Katharine Isabelle as Lindsay Clark

Tobias Mehler as Andy

Steve Railsback as Officer Cox

Terry David Mulligan as Mr. Clark

Susan Hogan as Mrs. Clark

A.J. Buckley as Charles 'Chug' Roman

Derek Hamilton as Trent

Tygh Runyan as Dickie Atkinson

Crystal Cass as Lorna

Ethan Embry as Allen Clark

Stephen E. Miller as Frankie

Natassia Malthe as Mary Jo Copeland

Doug Abrahams as Security Guard

Robert Moloney as Ferry Guy

Dan Zukovic as Mr. Rooney

David Paetkau as Tom Cox

Jay Brazeau as Principal Weathers

Sarah-Jane Redmond as Miss Perkins

Gillian Barber as Judy Effkin

Peter LaCroix as Mr. Strick

Lynda Boyd as Mrs. Strick

Daniella Evangelista as Daniella

Carly Pope as Abbey

Lalainia Lindbjerg as Kathy

Erin Tougas as Shannon

Ryan Taylor as Ryan - Blue Ribbon

Brendan Fehr as Brendan - Motor Jock

John Destry as Middle-Aged Man

Glynis Davies as Coupon Lady

Andre Danyliu as Roscoe

Stephen J. Lang as John (as Stephen James Lang)

Suzy Joachim as Female Doctor

Christopher R. Sumpton as Screaming Man

Jarred Blancard as Flossing Man

Kate Braidwood as Make-up Girl

Stephen Holmes as Toothbrush Boy

Mark Aviss as Bald Man

Julie Patzwald as Betty Caldicott

Dee Jay Jackson as Assistant Principal

Kendall Saunders as Disrespectful Student

Sean Amsing as Damon (uncredited)

Melanie Angel as Nurse (uncredited)

Christina de Cattani as Laughing Blonde Girl (uncredited)

Fulvio Cecere as Anesthesiologist (uncredited)

Garry Chalk as Coach (uncredited)

Cynde Harmon as Mrs. Atkinson (uncredited)

Tamsin Kelsey as Detrice (uncredited)

Corey Large as Student (uncredited)

Robert Lewis as Moderator (uncredited)

Zuzana Marlow as Shannon's Mother (uncredited)

Judith Maxie as Shadow Woman (uncredited)

Bob Wilde as Shadow Man (uncredited)

Bailee Reid as Chera - Blue Ribbon (uncredited)

Sean Smith as Schoolbus Boy (uncredited)

Clarence Sponagle as Nurses Assistant (uncredited)