Under the panic caused by his arrival, Moody takes a traumatised Harry to his office. He reveals himself to be Voldemort's 'faithful servant.' He explains that he put Harry's name into the Goblet of Fire under a different school and has been guiding him through the tournament to ensure he would touch the Cup first: he gave him the hint about flying, staged a conversation about Gillyweed in front of Dobby, cursed obstacles from outside the hedge maze, and used the Imperius Curse on Krum to force him to curse Cedric. As Moody prepares to kill Harry, Professors Dumbledore, McGonagall, and Snape intervene and stun Moody. Slowly, Moody changes appearance to become Barty Crouch Jr., the supposedly long-dead son of Barty Crouch Sr., who was using Polyjuice Potion to impersonate Moody.