| Ewan McGregor | Rodney Copperbottom |
| Halle Berry | Cappy |
| Robin Williams | Fender |
| Greg Kinnear | Ratchet |
| Mel Brooks | Big Weld |
| Drew Carey | Lugnut |
| Jim Broadbent | Madame Gasket |
| Amanda Bynes | Piper |
| Jennifer Coolidge | Aunt Fanny |
| Stanley Tucci | Tucci |
| Dianne Wiest | Mrs. Copperbottom (voice) |
| Paul Giamatti | Crank |
| Natasha Lyonne | Loretta Geargrinder |
| Terry Bradshaw | Broken Arm Bot |
| Dan Hedaya | Mr. Gunk |
| James Earl Jones | Voice box at hardware store |
| Jay Leno | Fire Hydrant |
| Al Roker | Mailbox |
| Stephen Tobolowsky | Bigmouth/Executive/Forge |
| Harland Williams | Lug |
| Lucille Bliss | Pigeon Lady |
| Dylan Denton | Youngest Rodney |
A robot leads a revolution against a corporate bigwig who wants to send older models to the scrapheap.
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