Rodney Copperbottom (voice)

Ewan McGregor

Acting

Cappy (voice)

Halle Berry

Acting

Ratchet (voice)

Greg Kinnear

Acting

Bigweld (voice)

Mel Brooks

Acting

Crank (voice)

Drew Carey

Acting

Piper (voice)

Amanda Bynes

Acting

Fender (voice)

Robin Williams

Acting

Madame Gasket (voice)

Jim Broadbent

Acting

Herb Copperbottom (voice)

Stanley Tucci

Acting

Mrs. Copperbottom (voice)

Dianne Wiest

Acting

Lug (voice)

Harland Williams

Acting

Aunt Fanny (voice)

Jennifer Coolidge

Acting

Tim the Gate Guard (voice)

Paul Giamatti

Acting

Loretta Geargrinder (voice)

Natasha Lyonne

Acting

Wonderbot / Phone Booth (voice)

Chris Wedge

Acting

Mr. Gunk (voice)

Dan Hedaya

Acting

Lamppost / Toilet Bot / Bass Drum / Microphone

Marshall Efron

Acting

Broken Arm Bot (voice)

Terry Bradshaw

Acting

Mailbox (voice)

Al Roker

Acting

Pigeon Lady (voice)

Lucille Bliss

Acting

Fire Hydrant (voice)

Jay Leno

Acting

Mr. Gasket (voice)

Lowell Ganz

Writing

Watch (voice)

Paula Abdul

Acting

Water Cooler (voice)

Jackie Hoffman

Acting

Trashcan Bot (voice)

Brian Scott McFadden

Acting

Tin Man (voice)

Tim Nordquist

Editing

Voice Box at Hardware Store (voice)

James Earl Jones

Acting

Stage Announcer (voice)

Damien Fahey

Acting

Bigmouth Executive / Forge (voice)

Stephen Tobolowsky

Acting

Younger Rodney (voice)

Jansen Panettiere

Acting

Young Rodney (voice)

Will Denton

Acting

Young Rodney (voice)

Crawford Wilson

Acting

Youngest Rodney (voice)

Dylan Denton

Acting

Additional Voices

Jennifer Perito

Acting

Jack Hammer (voice)

Alan Rosenberg

Acting

Additional Voices

Lara Cody

Acting

Additional Voices

Cooper Cowgill

Acting

Additional Voices

David Crommett

Acting

Additional Voices

Darin De Paul

Acting

Additional Voices

Dann Fink

Production

Additional Voices

Timothy Gulan

Acting

Additional Voices

Ray Iannicelli

Acting

Additional Voices

Sondra James

Acting

Additional Voices

Vanessa Lemonides

Acting

Additional Voices

Marcus Maurice

Acting

Additional Voices

David Rossmer

Acting

Additional Voices / ADR Loop Group

Bruce Winant

Production

Stage Announcer (voice)

Chris Moyles

Acting

DJ Robot (uncredited)

Chingy

Acting

Diesel (uncredited)

Sean Garnhart

Sound

Diesel (uncredited)

Paul Urmson

Sound

Watch #2 (voice) (uncredited)

Randy Jackson

Acting

Diesel (archive footage) (uncredited)

James Brown

Acting