Igor Karkaroff
Background
Igor Karkaroff is the high master of the Durmstrang Institute. During his trial for being a member of the Death Eaters, Karkaroff gave the names of other Death Eaters including Barty Crouch Junior.
During the events of Harry Potter and the Goblet of Fire (2005) played by Predrag Bjelac
Albus Dumbledore tells the students that Hogwarts will be hosting the Triwizard Tournament. Dumbledore introduces Madame Olympe Maxime and the students of the Beauxbatons Academy of Magic, including Fleur Delacour. He then introduces Karkaroff and the students of Durmstrang, which includes Viktor Krum. The Goblet of Fire is brought into the hall and Dumbledore tells the students that whoever wins the tournament will have eternal glory. Barty Crouch tells the students that no student under the age of 17 will be able to apply to participate for the Triwizard Tournament. During the champion selection, Cedric Diggory, Viktor, Fleur and Harry's names are chosen. Maxime and Karkaroff accuse Harry of cheating, but Barty Crouch says Harry must compete. After the tournament ends, Karkaroff and his students leave Hogwarts.