Thor has confronted Mangog, a demonic creature that intends to bring about Ragnarok in revenge against Odin for his exile. Although the creature has the upper hand against Thor, to begin with, Thor manages to grasp his hammer and use it to deliver powerful blows against the creature. This frees Thor from the monster's grasp, but the creature continues to be unharmed and easily bats the Thunder God away.

Boasting its victory over Thor, Mangog stops when he hears the jeers of the Warriors Three, who call the demon a coward for imprisoning them instead of battling them. Answering the warriors' taunts, Mangog frees them so that he might give them a taste of his power. Although the Warriors Three bravely face Mangog, they are easily outmatched by the nigh-unstoppable creature.

Back in Asgard, Loki is warned by Toag of Mangog's power; however, Loki tells his advisor that he only intends to keep Mangog alive long enough to see Thor destroyed so that he can ensure that Odin remains in his Odinsleep forever and that the combined magic of both he and Karnilla the Norn Queen would be sufficient enough to deal with Mangog. However, Loki's confidence wavers when several injured Asgardian warriors return to the palace to tell Loki of their failure and Mangog's continued approach.

On the battlefield, Thor revives and uses his power over the storms to summon a tornado that hurls large boulders at Mangog, who is still busy fighting off the Warriors Three. Thor then confronts Mangog up close, unleashing the full fury of his hammer at point-blank range. Mangog, however, continues his advance as Thor increases the power of his hammer. The lightning shot forth from the hammer soon causes the ground to erupt like a volcano, prompting Thor to fall back, hoping that the powerful explosion will distract Mangog enough to allow Thor and the Warriors Three a chance to escape and come up with a new strategy.

As the heroes escape on the Bifrost Bridge, Heimdall is greeted by the Rigellian Recorder that has come to Asgard to record the events that are transpiring for its masters. Remembering Thor's encounter with the Recorder, Heimdall allows one of Asgard's warriors to escort the Recorder to the royal palace to carry out its directives.

Back on the battlefront, Thor and the Warriors Three regroup just as the eruption stabilizes, and they are dismayed to see Mangog rise from the molten lava unmolested. When the creature begins hurling lava at them, Thor furiously unleashes a powerful storm that floods the area and washes Mangog away, giving them time to puzzle over how to stop the creature.

At the castle of Karnilla, the Norn Queen, Balder, continues to fight off reanimated warriors of Karnilla. Karnilla tells the brave warrior that she will call off his attackers if he pronounces his love for her, a request Balder denies. Karnilla tells him that his sentence is death unless he surrenders his heart to her.

Back at the royal palace, the Recorder finds Sif standing over Odin, who is still deep in his Odinsleep. The Recorder deduces that Mangog intends to draw the Odinsword and thereby cause the end of the universe. Unwilling to stand idly by, Sif decides that she will go to the Odinsword and defend it with her life if need be.

Finally, back at the scene of the battle, the storm unleashed by Thor has subsided, and as the Warriors Three regroup, Thor ventures forward to see the fate of Mangog, and finds that the creature still has survived and is about to resume its attack on the Thunder God.

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