By Alynda Wheat
Updated May 19, 2009 at 05:32 AM EDT

Marvel Studios announced today that Tom Hiddleston will play villain Loki in the upcoming production of Thor. The casting reunites Hiddleston with Thor director Kenneth Branagh, with whom he starred in last year’s Wallander and worked on a recent London production of Chekhov’s Ivanov. Thor, slated for May 2011, reportedly stars Chris Hemsworth (Star Trek) as soldier Thor, who triggers an ancient war, and is cast down to Earth as punishment.