Frankie Muniz as Jason Shepherd

Paul Giamatti as Marty Wolf

Amanda Bynes as Kaylee

Amanda Detmer as Monty Kirkham

Sandra Oh as Mrs. Caldwell

Russell Hornsby as Marcus Duncan

Michael Bryan French as Harry Shepherd

Christine Tucci as Carol Shepherd

Lee Majors as Vince

Donald Faison as Frank Jackson

Sean O'Bryan as Leo

Amy Hill as Joscelyn Davis

John Cho as Dustin Wong

Matthew Frauman as Lester Golub

Don Yesso as Rocco Malone

Rebecca Corry as Astrid Barker

Sparkle as Grandma Pearl

Taran Killam as Bret Callaway

Alexandra Breckenridge as Janie Shepherd

Ned Brower as Rudy

John Gatins as Tow Truck Driver

Andre Rosey Brown as Security Guard

Steven Shenbaum as Tram Guide

Jake Miner as Aaron

Ted Rooney as Boring Teacher

Marisa Petroro as Reporter

Randall Newsome as Photographer

Michelle Griffin as Shandra Duncan

Mike Smith as Limo Driver

Andrea Sevilla as Housekeeper

Pamela Paulshock as Female Extra

Erik Stabenau as Stunt Man

Tracey Cherelle Jones as Penny

Pat O'Brien as Pat O'Brien

Brian Turk as The Masher

Sandra Lee Gimpel as Old Lady

Tim Haldeman as Suburban Dad

Patrick Falls as Chopper Stunt Man

Timmy Fitzpatrick as Darren

Corinne Reilly as Wolf Party Guest

Shawn Levy as Wolf Party Guest

Dustin Diamond as Wolf Party Guest

Bart Myer as Wolf Party Guest

Kenan Thompson as Party Goer

Kanan Hooker as Ninja Kid

Houston Hooker as Ninja Kid

C.J. Picerni as Party Kid

Jaleel White as Jaleel White (uncredited)