Variety reports that director Kenneth Branagh has lined up his two lead stars for the film adaptation of the Marvel Comics series "Thor". Chris Hemsworth ("Star Trek") will take on the lead hero role of Thor while Tom Hiddleston (HBO's "The Gathering Storm") will take on the villain role of Loki.

The character of Loki is Thor's brother and tries to use his sorcery to kill him.

"Thor" is set to be released on May 20, 2011. It is expected that Hemsworth's deal includes "The Avengers" movie which Marvel is putting together for 2012, with the characters of Captain America, Iron Man and The Incredible Hulk set to appear.