Karl Diedrich Bader (born December 24, 1966) is an American actor and comedian. Bader is best known for his voice role as Batman on Batman: The Brave and the Bold. He has appeared in the films The Beverly Hillbillies, Napoleon Dynamite, Office Space and EuroTrip. In sitcoms, he has appeared on The Drew Carey Show, Veep, Outsourced and American Housewife. He has done voices for animated films such as Buzz Lightyear of Star Command, Ice Age and Surf's Up. Many Nickelodeon voice roles include the Rat King on several episodes of The Penguins of Madagascar; Nat Peterson, Harold, Spike the Bully Snail, Brad, Donna who's Mrs. Puff's prison mate, and various characters on SpongeBob SquarePants; and Hundun on Kung Fu Panda: Legends of Awesomeness.
He is also spotted in live-action Nickelodeon roles such as a guest contestant on Jeff Sutphen's Figure It Out, a random guy in the crowd of people from the Victorious episode "Tori Goes Platinum", and Chief Donker in two episodes of iCarly, "iGot A Hot Room" and "iPear Store".