The backstory of the Ultimate version of Thor. There are three parallel storylines here: events in Asgard eons ago, a Nazi invasion of Asgard lead by Baron Zemo, and modern day, with the current incarnation of Thor. Apparently, Thor had already appeared in Ultimates, which I haven't read yet. This probably explains the feeling that I had while reading this, like I was missing part of the story. It seems that I was. What was here was interesting enough, sure, but I think I might have gotten more out of it with the rest of the story. I'll be honest, I liked that the character designs seemed to be synched to the movie version of Thor, because that's basically all I know of the character.