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Richard Steven Horvitz is an American actor, voice actor, and comedian, known for his signature menacing hand gesture with the fingers curved inward. He is best known for voicing Alpha 5 in the Fox Kids series Mighty Morphin Power Rangers, Daggett Beaver in the Nickelodeon animated series The Angry Beavers, the titular character of Invader Zim, Billy and his father in the Cartoon Network series The Grim Adventures of Billy & Mandy, Grey Matter in the Ben 10 franchise, Rodney J. Squirrel in Squirrel Boy, and Moxxie in the adult animated web series Helluva Boss. He is also well-known for voicing Kaos, the overall main antagonist of the Skylanders video game franchise, and reprised this role in the spin-off television series Skylanders Academy.

For Disney, he voiced Ned Frischman in Dave the Barbarian, Aviarius in Kim Possible, a Ninja Fish in Fish Hooks, Christopher "Mouth" Gonzalez in Kick Buttowski: Suburban Daredevil, Yucky in Billy Dilley's Super-Duper Subterranean Summer, Scooper (uncredited) in Ted Brooks' crazy dream in Snow Dogs, and did additional voices in Mulan and the English dub of Studio Ghibli's Howl's Moving Castle. He also portrayed Teddy in the That's So Raven episode "Adventures in Boss Sitting". Additionally, he voiced Shiriki Utundu in the Tokyo DisneySea version of the Tower of Terror, Ocho the octopus in Elena of Avalor, and Big Cheese, Salty Pup, and Fryborg in The Bite-Sized Adventures of Sam Sandwich.

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