In Asgard, Thor leads the Asgardians into battle against some Ice Giants that are encroaching upon the realm.
On Earth, Jake Olson goes to the apartment of the Enchantress.
He finds she's not there, but her mystic mirror is, and touching it, sees himself as Thor.
Stepping through, he stands as a duplicate Thor, which drains the real Thor of some of his power, leaving him weakened in front of the Ice Giants.
Amora notices that there's something wrong with Thor, and using the Flame of Truth, sees what Jake has done.