Bartemius "Barty" Crouch, Jr. (gone undercover as Dark Wizard hunter Alastor "Mad-Eye" Moody) is a Dark Wizard and an infamous Death Eater, and the true secondary antagonist in the fourth Harry Potter book/film, Harry Potter and the Goblet of Fire. Crouch spends most of the story posing as the friendly teacher Alastor "Mad-Eye" Moody, and became the Defense Against the Dark Arts (D.A.D.A.) teacher at Hogwarts School for Witchcraft and Wizardry during the Triwizard Tournament, hosted by Hogwarts. He was sent by Voldemort, the most-powerful of all Dark Wizards and leader of the Death Eaters, to rig the Triwizard Tournament so that Harry Potter wins the tournament and use his blood to give Voldemort a new body.