Bartemius Crouch Junior

Bartemius "Barty" Crouch Junior is the son of Barty Crouch Sr.

Barty Junior was a Death Eater who was captured with the group responsible for torturing Frank and Alice Longbottom. His father, who headed the Department of Magical Law Enforcement at the time, sentenced him to life imprisonment in Azkaban.

However, Crouch's father rescued him as a favour to his dying mother. His father kept him under control with the Imperius Curse and forced him to hide under an Invisibility cloak at all times. Crouch was nursed back to health by Winky, the family's house-elf. Bertha Jorkins discovered the truth accidentally, and Lord Voldemort extracted this information from her several years later by breaking the memory charm placed on her by Crouch Sr. Voldemort rescued Crouch and put his father under the Imperius Curse. Crouch then kidnapped Mad-Eye Moody and, with the help of the Polyjuice Potion, took over Moody's job of teaching Defence Against the Dark Arts at Hogwarts.

The Triwizard Tournament was being held that year and Crouch had to make sure that Harry won. Before the third and final task of the tournament, he volunteered to place the Triwizard Cup in a maze through which the contestants were to navigate. He took advantage of this opportunity and turned the cup into a portkey which transported Harry Potter and Cedric Diggory to a graveyard when they took it together. Harry's blood was to be used to bring Voldemort back to power. The plan succeeded, but Harry escaped with Cedric Diggory's body.

Crouch then attempted to kill Harry to repair the damage, but didn't succeed. Under the influence of a powerful truth potion, he told what had happened to Albus Dumbledore. His soul was sucked out of him when he received the Dementor's Kiss.