The movie opens with Odin waging war against the Frost Giants of Jotunheim to prevent them from conquering the nine realms, including Earth. The Asgardians seize their source of power and the Frost Giants attempt to retrieve it just before Thor (Odin’s son) is about to ascend to the throne. When Thor travels to Jotunheim to confront their leader, an all-out war erupts, and Odin is forced to intervene. Because Thor is unapologetic and arrogant about his actions, Odin exiles him to earth, in hopes that he’ll learn his lesson.
Before I continue, I’d like to confess that I ripped that entire plot off from Wikipedia, because I had absolutely no idea what was going on for the first twenty minutes of the film. That’s either because I have a pea-sized brain, or because I was not familiar with the story before entering the film, and it wasn’t properly executed for comic-book novices such as myself. Regardless, that opening scene was simply too long. The real fun of the film begins when Thor is banished to earth, and he becomes a fish out of water.
UPDATE: IT’S OFFICIAL!