Between all the superheroes and supervillains, directing a Marvel movie takes an effort that verges on the superhuman. But when he was making Thor: Ragnarok, Taika Waititi had to do more than wrangle Thor, Loki, and the Hulk; he also cast himself as Korg, the stone-man gladiatorial fighter who becomes Thor's new mate. "I usually put myself in my films," says Waititi, who played a vampire in his 2014 horror spoof, What We Do in the Shadows. Turning into Korg, though, required more than fangs and makeup. In addition to a mo-cap suit, he also had to lug around a camera rig, battery packs, and Korg's face, all while acting (and joking) alongside Chris Hemsworth's God of Thunder.