Richard Steven Horvitz is an American actor, voice actor, and comedian. He is perhaps best known for roles as Alpha 5 in Mighty Morphin Power Rangers, Kaos in the Skylanders franchise, Dagget Beaver in The Angry Beavers, Billy in The Grim Adventures of Billy and Mandy, Rodney J. Squirrel in Squirrel Boy, and the titular character in Invader Zim.
For Disney, he voiced Ned Frischman in Dave the Barbarian, Aviarius in Kim Possible, a ninja in Fish Hooks, Mouth in Kick Buttowski: Suburban Daredevil, Yucky in Billy Dilley's Super-Duper Subterranean Summer, Scooper in Ted Brooks' crazy dream in Snow Dogs (uncredited), and additional voices in both the 1998 animated films: Mulan and Howl's Moving Castle. He also played Teddy in the That's So Raven episode "Adventures in Boss Sitting" and voiced Shiriki Utundu in the Tokyo DisneySea version of the Tower of Terror. Additionally, he voiced Ocho the octopus in Elena of Avalor.