Collects Mighty Thor (2015) #1-5. When Dr. Jane Foster lifts the mystic hammer Mjolnir, she is transformed into the Goddess of Thunder, the Mighty Thor! Her enemies are many as Asgard descends further into chaos, and unrest threatens to spread throughout the Ten Realms. Yet she wages her greatest battle against a far more personal foe: the cancer killing her mortal form. When Loki steps back into Thor's life, will it ease her troubles or only add to her pain? There's no such question about Malekith as he continues to fan the flames of a looming War of Realms — when he isn't wedding planning, that is! And as Asgard is torn apart, the skies will shake in one of the bloodiest battles of all time: It's Thor vs. Odin like never before!