Hafþór Júlíus Björnsson is an Icelandic actor, professional strongman, and former basketball player. He achieved international recognition after winning multiple World's Strongest Man and Arnold Strongman Classic titles, becoming one of the most successful competitors in the history of the sport. As an actor, he is best known for portraying Gregor "The Mountain" Clegane in the television series Game of Thrones, and has since appeared in films and television productions that frequently draw on his imposing physical presence. In Masters of the Universe, he portrays Goat Man.