Karl Diedrich Bader (born December 24, 1966), better known as Diedrich Bader, is an American actor and comedian. Many know him for his roles as the self-defense instructor Rex from Napoleon Dynamite, Oswald from The Drew Carey Show, Charlie Davies from Outsourced and his voice portrayal of Batman on Batman: The Brave and the Bold. Bader is also well remembered in his voice roles as the android Zeta in the Batman Beyond spinoff, The Zeta Project, Warp Darkmatter 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 and Mandy. Bader was born Karl Diedrich Bader in Alexandria, Virginia, on Christmas Eve, 1966, the son of German-born Gretta Bader, a sculptor, and William B. Bader, a foundation executive who worked in politics. His great-grandfather was German American politician Edward L. Bader, former mayor of Atlantic City, New Jersey. When Bader was two years old, his family moved to Paris, France, but he returned to the U.S. to attend Groveton High School. He graduated from T.C.