Game of Thrones villain Ser Gregor Clegane is a big dude. That's no secret. He's nicknamed the frickin' Mountain, for goodness' sake.
But actor Hafþór Júlíus Björnsson wasn't always the towering hulk we've come to know and fear - a new picture has emerged from 2006, back when he was just 17.
What to Read Next
At the time, Björnsson was a basketball player - kicking off his career with the Iceland-Dominos league's KR Basket Reykjavík basketball team.
He later went on to become a professional strongman - earning his highest spot of second place in 2014's World's Strongest Man contest.
Björnsson revealed his insane diet earlier this year - and after wolfing down that little lot, we're not at all surprised that he's managed to bulk up!
Game of Thrones airs on Sundays at 9/8c on HBO in the US, with a 2am simulcast on Sky Atlantic in the UK. A primetime repeat follows at 9pm BST.
Game of Thrones: 8 things we learned from episode 8 'No One'
Watch the thrilling teaser for next week's Game of Thrones right here:
