Thor has returned to Earth to rescue Sif from the clutches of Ulik. To search for his foe unnoticed, Thor taps his hammer and changes back into the mortal form of Donald Blake, playing right into the plot that Geirrodur (ruler of the Rock Trolls) had intended for the Thunder God to do. One of the Rock Troll devices picked up this transformation and relayed it to Ulik, who is hiding out with the unconscious Sif in New York's subway system with an army of Rock Trolls.

They use a "Molecular Disperser" to make the ground under Donald Blake intangible so that they can grab him and pull him under the street and remove his walking stick from him. As Ulik demands that Blake explain how the cane works, the Rock Troll holding the cane, deciding to take the power of Thor for himself, quietly asks Blake how the cane works. Playing the advantage that only he may cause the enchantment that changes the stick into his enchanted hammer, Blake explains its operation to the Troll. When the Rock Troll taps the cane, Blake quickly darts a hand out so that he is grasping it as it's connecting with the ground, and he is transformed into Thor once more. Regaining hold of his hammer, Thor renews his battle against Ulik.

While back on Asgard, the Rock Trolls' invasion of the realm begins, and they defeat Asgard's first war party, taking them all prisoner before they can send anyone back to get reinforcements. Informing Geirrodur of the victory, the king of the Rock Trolls decides to check with the Orikal to learn of their team's progress, which is digging a secret tunnel into the heart of Asgard itself. The Orikal advises Geirrodur that his forces are nearing the city of Asgard and that their attack will begin soon.

Meanwhile, back on Earth, Thor and Ulik's battle rages on. Even though Ulik has the advantage of having a small army help him, Thor manages to beat them aside. Thor then finds Sif's body and tries to figure out a way to free her body when one of the Trolls sneaks up behind him with the Orb of the Orikal. Thinking that it is a weapon against him, Thor throws his hammer and realizes too late what it's meant for "capturing his Hammer." Succeeding in collecting Thor's hammer, the Rock Trolls teleport back to Asgard to join their comrades in their battle against Asgard. As they depart, Sif is freed from the cocoon she has been trapped in and learns of the grave situation, stuck on Earth with Thor, who will change back to Donald Blake in 60 seconds without his hammer, and neither with a way to return to Asgard.

While back on Asgard, the Rock Trolls begin attacking the kingdom of Asgard with all their forces. Odin sends all his troops to counterattack however they prove unable to stop the advancing attackers, and Odin calls to his son for help. Thor hears these cries back on Earth but feels nothing but helplessness as he cannot answer them.
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