Thunder In The Netherworld! Thor has been transported to Olympus to fight on behalf of Hercules, who has been caught in an Olympian Pact to take over the rule of Hades from Pluto. Accepting the challenge, Pluto transports the Thunder God to Hades, where he is to fight Pluto's hordes and prevent Pluto himself from crowning Hercules with the Crown of Hades, which would consummate their pact. Traveling through Hades, Thor is confronted with the first of many battles: With the being known as Cerberus. This a battle easily won by Thor, who manages to overpower the giant.
While on Earth, Jane Foster worries about Thor and fears the worst. When her roommate Tana Nile hears of her situation, she suddenly can hypnotize Jane and commands her to go on a long journey and not return.
Back in Hades, Hercules is brought before Pluto, who is about to crown the Prince of Power with the Crown of Hades, when Thor suddenly bursts in to stop the ceremony. When Hercules breaks free and tries to aid, he is struck down by Zeus, who orders Hercules to let his chosen champion determine his fate. Thor battles Pluto's forces, defeating every obstacle in his way until he is caught in a Turbulence Chamber that threatens to destroy him.
Meanwhile, on Earth, still under Tana Nile's control, Jane packs her things and leaves New York City. Leaving Tana, an alien invader, to begin her preparations for an Earth invasion. In Hades, Thor withstands the Turbulence Chamber and manages to break free, fighting Pluto's warriors, including the super-strong Crusher. Thor continues to fight through these armies, causing massive damage to the realm. Seeing the destruction of the empire that he took centuries to build up, Pluto calls an end to the combat and agrees to cancel the Pact that Hercules signed. Witnessing Pluto tearing up the contract causes Hercules to rejoice a little too much and almost causes the room to fall on their heads.
When Hercules is about to start a fight with Pluto, Thor stops him and convinces the Prince of Power that to battle, and Pluto would act like a weaker man. Hercules thanks Thor for his aid and the two Gods leave Hades as comrades.
