Vo filme Roboti hrajú 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)), Tim Nordquist (Tin Man (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)), Dylan Denton (Youngest Rodney (voice)), Jennifer Perito (Additional Voices), Alan Rosenberg (Jack Hammer (voice)), Lara Cody (Additional Voices), Cooper Cowgill (Additional Voices), David Crommett (Additional Voices), Darin De Paul (Additional Voices), Dann Fink (Additional Voices), Timothy Gulan (Additional Voices), Ray Iannicelli (Additional Voices), Sondra James (Additional Voices), Vanessa Lemonides (Additional Voices), Marcus Maurice (Additional Voices), David Rossmer (Additional Voices), Bruce Winant (Additional Voices / ADR Loop Group), Chris Moyles (Stage Announcer (voice)), Chingy (DJ Robot (uncredited)), Sean Garnhart (Diesel (uncredited)), Paul Urmson (Diesel (uncredited)), Randy Jackson (Watch #2 (voice) (uncredited)), James Brown (Diesel (archive footage) (uncredited)).