Many know him for his roles as the self-defense instructor Rex from "Napoleon Dynamite", Oswald Harvey from "The Drew Carey Show", Charlie Davies from "Outsourced " and his voice portrayal of Batman on "". 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".