John DiMaggio performed the voice of the robot Bender Bending Rodríguez and other, more minor, characters. Bender was the most difficult character to cast, as the show's creators had not decided what a robot should sound like. DiMaggio originally auditioned for the role of Professor Farnsworth, using the voice he uses to perform Bender, and also auditioned for Bender using a different voice. DiMaggio described Bender's voice as a combination of a sloppy drunk, Slim Pickens and a character his college friend created named "Charlie the sausage-lover".