Under the panic caused by his arrival, Moody takes Harry to his office. He reveals himself to be Voldemort's servant, having put Harry's name into the Goblet, and guided him throughout the tournament to ensure he would touch the Cup. As Moody prepares to kill Harry, Dumbledore, McGonagall, and Snape intervene and stun Moody. Moody is revealed to be impersonated by Barty Crouch Jr., Crouch's son, via Polyjuice Potion. Using Veritaserum, they learn that Crouch had rescued his son as a favour to his dying wife. Crouch Jr. was kept at home, until Winky convinced Crouch to allow him to see the Quidditch Cup, where he escaped, stole Harry's wand, and conjured the Dark Mark. Voldemort discovered Crouch Jr. and plotted to install him at Hogwarts, abducting the real Moody. Crouch was imprisoned by Wormtail, and when he escaped to Hogwarts, Crouch Jr. killed him.