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.
The series follows several simultaneous plotlines. The first story arc follows a war of succession among competing claimants for control of the Iron Throne of the Seven Kingdoms, with other noble families fighting for independence from the throne.
