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.
Quintessa brainwashes Optimus Prime and heads to Earth to search for an ancient staff. Cade, Bumblebee and the Autobots race against time to find it, while also escaping an anti-Transformers force.
