Karl Diedrich Bader (born December 24, 1966) is an American film, television and voice actor. He has appeared as a series regular in television sitcoms The Drew Carey Show, American Housewife, and Outsourced, along with notable recurring roles in Better Things and Veep. His film credits include The Beverly Hillbillies, Office Space, EuroTrip and Napoleon Dynamite. He is also an accomplished voice actor for multiple animated series; some of his roles include Bruce Wayne / Batman on Batman: The Brave and the Bold, Harley Quinn, JLA Adventures: Trapped in Time, and Bojack Horseman. His other voice roles include the android Zeta in The Zeta Project, Warp Darkmatter/Agent Z in Buzz Lightyear of Star Command, the Fiskerton Phantom in The Secret Saturdays and his recurring role as Hoss Delgado in The Grim Adventures of Billy & Mandy.
He also reprised Tank Evans' role in Surf's Up and Surf's Up 2: WaveMania and Rufus' role in Open Season 2.