Hafþór Júlíus Björnsson is an Icelandic professional strongman, actor, and former professional basketball player.
He plays Ser Gregor "The Mountain" Clegane in the HBO series Game of Thrones.
In Middle-earth, Bilbo Baggins is convinced by the wizard Gandalf the Grey to accompany thirteen dwarves, led by Thorin Oakenshield, on a quest to reclaim the Lonely Mountain from the dragon Smaug.