Richard Steven Horvitz

Richard Steven Horvitz (born July 29, 1966) is an American actor and voice actor who is best known for doing the voice for Alpha 5 in Mighty Morphin Power Rangers, Power Rangers Zeo, and Power Rangers Turbo, the title character Zim in the Nickelodeon animated series Invader Zim, Billy and his dad Harold in the Cartoon Network animated series The Grim Adventures of Billy &amp; Mandy and Razputin Aquato in the video game Psychonauts.

He voiced Ned Frischman in Dave the Barbarian, Aviarius in Kim Possible, a ninja in Fish Hooks, Mouth in Kick Buttowski: Suburban Daredevil, Scooper in Ted Brooks' crazy dream in Snow Dogs (uncredited), and additional voices in the 1998 Disney animated film, Mulan and in Howl's Moving Castle. He also played Teddy in That's So Raven (episode: "Adventures in Boss-Sitting").