Top 35 Trivia Items from "Game of Thrones"29 of 35
Hafþór Júlíus Björnsson was the third actor to take on the role of Gregor 'The Mountain' Clegane (aka "The Mountain"), a role previously played by Conan Stevens in the first season, and Ian Whyte in the second season. Whyte had a brief appearence in the third season premiere, though as a different character - Wun Wun.
PeopleHafþór Júlíus Björnsson
Photo by Macall B. Polay/ HBO