Rock Trolls has separated Thor's hammer from him, trapping both him and Sif in New York City. As the seconds before Thor transforms back into Donald Blake tick by, Sif refuses to accept defeat and attempts to use her latent mystical talent to transport them back to Asgard. This succeeds, and the two find themselves transported back to the home of the Rock Trolls. There they stumble upon the fact that the Rock Trolls seek to make a replica of Thor's hammer so that they might better crush the Gods and take over Asgard.

While in the city proper, Odin and his forces continue to try and defend the city; however, they are easily fought back by the Rock Trolls and their advanced weaponry, which force the Orikal to build for them. Believing that his son has abandoned him, Odin enters the fray with his Scepter of Power, however, finds bested when the Rock Trolls arrive with a weapon that drains it of its power, rendering it useless. Unwilling to accept defeat, Odin tosses the useless weapon aside and orders his warriors back into battle.

While in the underground cavern of the Rock Trolls, Thor and Sif find Ulik, who has had the Rock Troll's best forgers create a duplicate hammer. Thor reveals himself to Ulik, using the enchantment that pulls the hammer back into his possession to divest Ulik of one of the hammers in his hands. Although both have equal weapons, Thor can gain an advantage in combat. Witnessing Ulik's failing performance in battle, Geirrodur grabs a Menti-Horn and calls the Orikal to come to their aid and destroy the Thunder God.

The Orikal appears before Thor and Sif and tells the Thunder God that he only fights for Geirrodur because the King of the Rock Trolls has him enslaved with mystical flames. Thor tells the Orikal that there is another way when Ulik once more attacks. Thor fights Ulik off, who flees to the flames control switch and threatens to turn it to full power. Thor prevents this by quickly throwing his hammer, which knocks Ulik out.

Thor then frees the Orikal, who thanks Thor for rescuing him, and departs Asgard, taking the energy which powers the Rock Troll's weapons with him. As the tide of battle turns, and the Rock Trolls are sent fleeing back to their domain, Geirrodur agrees to surrender and complies with Thor's demand that the Rock Trolls return to their home. Thor then uses the Rock Troll's tunnel to return to the city of Asgard, where he is reunited with his father and hailed as a hero by the people of Asgard.

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