 The crown prince of Asgard , based on the Norse mythological deity of the same name . Hemsworth was cast as part of a multiple movie deal . He had previously worked with Joss Whedon on The Cabin in the Woods . Hemsworth said that he was able to maintain the strength he built up for Thor by increasing his food intake , consisting of chicken breasts , fish , steak , and eggs every day . When asked exactly how much , Hemsworth said , " My body weight in protein pretty much ! " He remarked that Thor 's motivation " is much more of a personal one , in the sense that it 's his brother that is stirring things up . Whereas everyone else , it 's some bad guy who they 've gotta take down . It 's a different approach for me , or for Thor . He 's constantly having to battle the greater good and what he should do vs. it 's his little brother there . . . I 've been frustrated with my brothers at times , or family , but I 'm the only one who is allowed to be angry at them . There 's a bit of that . " 
