Ewan McGregor
Rodney Copperbottom (voice)
Acting
Robin Williams
Fender (voice)
Acting
Halle Berry
Cappy (voice)
Acting
Amanda Bynes
Piper (voice)
Acting
Mel Brooks
Bigweld (voice)
Acting
Jim Broadbent
Madame Gasket (voice)
Acting
Greg Kinnear
Ratchet (voice)
Acting
Stanley Tucci
Herb Copperbottom (voice)
Acting
Dianne Wiest
Mrs. Copperbottom (voice)
Acting
Drew Carey
Crank (voice)
Acting
Harland Williams
Lug (voice)
Acting
Jennifer Coolidge
Aunt Fanny (voice)
Acting
Paul Giamatti
Tim the Gate Guard (voice)
Acting
Natasha Lyonne
Loretta Geargrinder (voice)
Acting
Chris Wedge
Wonderbot / Phone Booth (voice)
Acting
Dan Hedaya
Mr. Gunk (voice)
Acting
Marshall Efron
Lamppost / Toilet Bot / Bass Drum / Microphone
Acting
Terry Bradshaw
Broken Arm Bot (voice)
Acting
Al Roker
Mailbox (voice)
Acting
Lucille Bliss
Pigeon Lady (voice)
Acting
Jay Leno
Fire Hydrant (voice)
Acting
Lowell Ganz
Mr. Gasket (voice)
Writing
Paula Abdul
Watch (voice)
Acting
Jackie Hoffman
Water Cooler (voice)
Acting
Brian Scott McFadden
Trashcan Bot (voice)
Acting
Tim Nordquist
Tin Man (voice)
Editing
James Earl Jones
Voice Box at Hardware Store (voice)
Acting
Damien Fahey
Stage Announcer (voice)
Acting
Stephen Tobolowsky
Bigmouth Executive / Forge (voice)
Acting
Jansen Panettiere
Younger Rodney (voice)
Acting
Will Denton
Young Rodney (voice)
Acting
Crawford Wilson
Young Rodney (voice)
Acting
Dylan Denton
Youngest Rodney (voice)
Acting
Jennifer Perito
Additional Voices
Acting
Alan Rosenberg
Jack Hammer (voice)
Acting
Lara Cody
Additional Voices
Acting
Cooper Cowgill
Additional Voices
Acting
David Crommett
Additional Voices
Acting
Darin De Paul
Additional Voices
Acting
Dann Fink
Additional Voices
Production
Timothy Gulan
Additional Voices
Acting
Ray Iannicelli
Additional Voices
Acting
Sondra James
Additional Voices
Acting
Vanessa Lemonides
Additional Voices
Acting
Marcus Maurice
Additional Voices
Acting
David Rossmer
Additional Voices
Acting
Bruce Winant
Additional Voices / ADR Loop Group
Production
Chris Moyles
Stage Announcer (voice)
Acting
Chingy
DJ Robot (uncredited)
Acting
Sean Garnhart
Diesel (uncredited)
Sound
Paul Urmson
Diesel (uncredited)
Sound
Randy Jackson
Watch #2 (voice) (uncredited)
Acting
James Brown
Diesel (archive footage) (uncredited)
Acting