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.
When he holds up the magical Sword of Power and utters the words "By the power of Grayskull," Prince Adam is transformed into Eternia's greatest champion, He-Man, who uses his powers to defend the realm from Skeletor and his evil forces.
