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.
J'onn comes face-to-face with his brother Ma'alefa'ak for the first time in a very long time. Little does he know that Ma'alefa'ak has murderous intentions for Planet Earth.
