Odin's most famed son, Thor, god of thunder, wields the magical hammer, Mjöllnir. He is known for his grand adventures, battles against evil, and his protection of humanity. He brings a rogue Loki to justice after Baldr's death, and is foretold to finally perish during Ragnarök after winning an epic battle with his longtime nemesis, the giant world-serpent, Jörmungandr.
In this last movement, we hear Thor's theme rising, as if for one final battle, even as the wind picks up, and the fight is met. As Thor's fury begins to make itself heard, Mjöllnir's theme, depicted as the flashing brass of trumpets and trombones, combines with the impact of the lightning and thunder it calls forth. As the tide of battle turns, Thor's theme takes on a more heroic aspect, even as hints of Loki's machinations begin to weave their way through the fight. At the climactic moment, our hero must make a decision that will either save or doom us all, as the sun rises once more over Midgard.