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.
After narrowly escaping a doomed fate in an asylum, an undead warrior fights his way through the desolate remains of Lordran, once a sprawling utopia lead by the gods, to seek his purpose and fulfill a centuries old prophecy.