•
Ewan McGregor as Rodney Copperbottom, an idealistic young blue robot and aspiring inventor •
Will Denton and Crawford Wilson as Young Rodney •
Jansen Panettiere as Younger Rodney • Dylan Denton as Youngest Rodney •
Halle Berry as Cappy, a straight-laced executive at Bigweld Industries and Rodney's love interest •
Robin Williams as Fender Pinwheeler, a mischievous red
blender-like robot who befriends Rodney and is constantly falling apart •
Mel Brooks as Bigweld, an elderly
spherical robot who is the caring inventor, philanthropist and founder of Bigweld Industries. He was also the host of The Bigweld Show from Rodney's childhood. •
Greg Kinnear as Phineas T. Ratchet, the menacing and arrogant right-hand-robot of Bigweld and Madame Gasket's son •
Jim Broadbent as Madame Gasket, the evil owner of the Chop Shop and Ratchet's mother •
Amanda Bynes as Piper Pinwheeler, a plucky yellow
tomboy robot who is Fender's younger sister and has a crush on Rodney •
Drew Carey as Crank Casey, a cynical orange
vacuum cleaner-like robot who befriends Rodney •
Jennifer Coolidge as Aunt Fanny (known as Aunt Fan in the UK and Australian versions), a motherly
snail-like robot who takes in outmoded and homeless robots •
Harland Williams as Lugnut or "Lug", an imposing but good-natured green muscular robot who befriends Rodney along with his best friend Diesel, a slim, mute robot who lacks a
voice box •
Alan Rosenberg as Jack Hammer, a rusty copperish orange robot who works at a hardware store •
Stanley Tucci as Herb Copperbottom, Rodney's father and a
dishwasher at Gunk's Greasy Spoon •
Dianne Wiest as Lydia Copperbottom, Rodney's mother •
Chris Wedge as Wonderbot, a small
cup-like robot with a propeller who is Rodney's invention • Wedge also voices a Phone Booth •
Natasha Lyonne (US version)/
Cat Deeley (UK version)/
Jackie O (Australian version) as Loretta Geargrinder, a receptionist at Bigweld Industries and Fender's love interest •
Paul Giamatti as Tim, the
puppet gatekeeper at Bigweld Industries •
Dan Hedaya as Mr. Gunk, Herb's cynical, inconsiderate boss • Brian Scott McFadden (US version)/
Vernon Kay (UK version) as
Trashcan Bot •
Jay Leno as
Fire Hydrant •
Lucille Bliss as
Pigeon Lady •
Paula Abdul and
Randy Jackson (US version)/six children who won a competition to participate in the film (Australian version) as
Wristwatches •
Al Roker as Mailbox •
Marshall Efron as a
Lamp Post • Efron also voices a
Toilet Bot, a
Bass Drum, and a
Microphone • Randall Montgomery as Zinc, a ramshackle car robot •
Stephen Tobolowsky (US version)/
Eamonn Holmes (UK version) as Bigmouth Executive • Toblowsky also voices Forge • Tim Nordquist as
Tin Man •
Damien Fahey (US version)/
Chris Moyles (UK version) as Stage Announcer •
Lowell Ganz (US version)/
Terry Wogan (UK version) as Mr. Gasket, Madame Gasket's husband and Ratchet's father. •
James Earl Jones as a
Darth Vader voice box that the silent robot Diesel tries •
James Brown as Diesel's singing voice (
archival recording) ==Production==