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Richard Steven Horvitz (born July 29th, 1966) is an American actor and voice actor. He is known for voicing such characters as Billy and his father Harold in The Grim Adventures of Billy and Mandy, the titular character of Invader ZIM, Daggett in The Angry Beavers, and Kaos, the main antagonist of the Skylanders series.


  • Billy, Billy's Father - The Grim Adventures of Billy and Mandy
  • ZIM - Invader ZIM
  • Daggett Beaver - The Angry Beavers
  • Kaos - Skylanders
  • Alpha 5 - Mighty Morphin Power Rangers
  • Rodney J. Squirrel - Squirrel Boy
  • Orthopox - Destroy All Humans
  • Grey Matter - Ben 10