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.
All the good guys team up. All the bad guys team up. You can add anybody, AND I MEAN ANYBODY, just as long as it's an official character and not just some dumb OC you made up.
