The summer of 2011 will see the biggest assemblage yet of superheroes onscreen with the upcoming releases of X-Men: First Class, Green Lantern, and Captain America: The First Avenger. (At least until next year when The Avengers hits theaters.) Every movie is a gamble to some degree, but these three mitigate the risk a bit in that the X-Men film is the fourth in a popular franchise and the other two both feature highly recognizable actors in the title roles. But there’s one superhero movie this summer that’s flying with a hammer in place of a safety net. The potential hurdles include a relatively unknown lead actor, a director thought to be an odd choice at best and a terrible one at worst, and a hero built on magic and fantasy. Thor is a god, an honest to god deity, and that can be a hard sell in the science-fiction and technology-filled world of Marvel films. Thor opens with a brief intro in the Southwestern US with a pair of scientists (Natalie Portman and Stellan Skarsgard) and their snarky assistant (Kat Dennings) tracking an odd weather phenomenon. They drive towards the center of the storm and accidentally collide with a figure emerging from the darkness.

We reported just yesterday morning that Marvel is preparing to shoot their next big comic book film Thor in January, with director Kenneth Branagh now ready to get the story of gods and warriors from another dimension underway. And with that has come a few last minute casting decisions.