He is ruler of the Overtakers, and appeared in Kingdom Keepers II: Disney At Dawn. He is the demon in the last scene in Fantasia, Night on Bald Mountain/Ave Maria, with the ghosts on Halloween. He is the Disney Characters' worst enemy. In Disney in Shadow, Chernabog was transformed into a dragon by Maleficent, but disappeared shortly afterward. He was seen at Expedition Everest.
Chernabog then, shortly reappeared in book 5 Shell Game. He is also said to be in a sleeping state (called torpor) during books 3, 4, and most of 5.
In Shell Game, Chernabog is said to be in a cage backstage of the theater. To get on the ship, he was delivered by a plane on Castaway Cay.
In book 6 Dark Passage, Chernabog appears stronger than ever and never makes a real appearance in the book.
In the most recent book, The Insider, Chernabog is defeated by Finn, the Kingdom Keepers' leader, on the top of the Matterhorn at Disney Land.