Thor

After the credits of Iron Man 2, we see a short-handled hammer lying in a crater in New Mexico. Whos hammer could it be?

The Marvel version of Thor is noble and very self-assured, sometimes to the point of arrogance. Thor's father Odin decides his son needs to be taught humility and consequently places Thor (without memories of godhood) into the body and memories of an existing, partially disabled human medical student, Donald Blake. After becoming a doctor and thoroughly believing himself to be the young surgeon Blake, he later discovers Thor's disguised hammer and learns to change back and forth into the Thunder God. The real Blake's persona remains elsewhere until many years later, after Odin becomes satisfied of Thor's humility and lifts the spell, thereby removing the need for a mortal alter ego. The mortal experience, however, shapes Thor into an honorable and courteous individual, who is loyal to all comrades.

A reliable source informs us that the Donald Blake character has been added to the end of the Kenneth Branaugh directed Thor movie. This is a recent addition to a film that has been set placed only in the land of the Norse gods.