While seeking to escape Asgard's destruction at Surtur's hands, Loki and one of his followers escape to Earth. However, they find that Surtur's coming has also caused environmental upheaval on Earth itself, leaving Loki to hope that his hated half-brother finds some way to defeat Surtur.

While back in Asgard, the royal city has been set ablaze by the coming of Surtur, prompting Thor to gather an army of warriors to fight against the fire demon. They rally together and, with the help of Thor's mystical hammer, break through the flame barrier erected in front of the city and charge toward Surtur himself.

While elsewhere, Balder and Sif seek out Igron, an evil mystic loyal to Loki responsible for sending Odin to the Sea of Eternal Night. They tell them of their quest to free Odin and explain that if he does not help them, all of Asgard will be destroyed by Surtur. While back on the battlefield, Thor takes on Surtur on his own, and despite his great strength and mystical hammer, can only do so much as keep Surtur on the defensive, but the noble Thunder God refuses to give up.

While back at the lair of Igron, Balder agrees to be transported to the Sea of Eternal Night, even though he will rapidly wither away within moments of his arrival. Although growing rapidly old with every passing moment, Balder manages to make it to the capsule where Odin slumbers and awakens the All-Father, who proclaims that his Odinsleep has ended.

On the battlefield, Odin is joined by the other warriors who lend their might to keep Surtur back, even going so far as to drop a large meteor on him, but to no avail. As the battle rages on, Balder brings Odin back at a terrible price: Balder has aged to a frail and deathly state. However, Odin is alive and well and vows to Sif that he can restore Balder anew.

Finally, Thor's army cannot stop Surtur back on the battlefield and is forced to use their last resort: A frost gun. However, this only momentarily staggers Surtur, who uses all his power to blast everyone into unconsciousness, leaving only Thor, the only one standing to face him. However, before the battle can continue, Odin arrives and banishes Surtur back to his realm. When the reviving warriors realize who saved them, they all raise their weapons in honor of Odin.

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