Following the defeat of M.O.D.O.K, Thor is called back to Asgard by his father, telling him that his time is nearly up, and that he needs Thor to take the mantle of King of Asgard, but before he can do so, he must battle the Rock Trolls, who were forced deep underground by Odin thousands of years ago, who have resurfaced, with a goal to destroy Asgard and reclaim the ruins as their own.
