Aaahh!!! Real Monsters is an American animated television series about adolescent monsters in training, developed by Klasky Csupo for Nickelodeon. The show ran for four seasons on Nickelodeon's main United States cable channel (from 30 October 1994 to 6 December 1997), and was rerun on Nicktoons Network until 2006. Taken from the Wikipedia article on the series.