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