Ymir is one of the oldest and most powerful Frost Giants from the Thor universe. The Frost giants appear in the Thor movie but the look there is quite different from the comic versions. On a side note the Thor movie is actually quite a decent superhero flick – check it out if you haven’t already (don’t bother with the 3D version though – it just spoils some of the fight scenes and other scenes look like cardboard cut outs- stick to the 2D version if you can).
