Richard Steven Horvitz is an American actor, voice actor and comedian, who voiced several Lorbs in Seasons 2 and Season 3 of Rapunzel's Tangled Adventure. He is best known for his voice roles as Alpha 5 in Mighty Morphin' Power Rangers, Dagget Beaver in The Angry Beavers, Billy in The Grim Adventures of Billy and Mandy, and the titular character in Invader Zim.