Spider-Man fights Magma under the volcano. Meanwhile, Joy Mercado tries to flee with Charla and Seth, but they are stopped by Magma's men. Seeing that the best strategy at that moment is to flee, Spidey runs away leaving Joy and the rest in the hands of Magma.

Magma shows them the central complex and soon asks the young Seth to sit and keep doing his job. Magma explains that the boy is, though mentally deficient, what scientists call an idiot savant: he can formulate mathematical equations so advanced that the most sophisticated computers cannot match them. Joy also notices that the financing needed for this operation has been provided by the Roxxon corporation, as Magma himself further explains.

Then Peter Parker appears as a new hostage and is imprisoned together with Joy in a cell. They soon escape, knock out some guardians, and also free the boy and his mother. They go through the tunnels in search of an escape route, until the Magma's men find them and Peter gets separated, as he had planned so that he can act as Spider-Man again.

Spider-Man attacks Magma again, and during the battle, the lava blast of the villain provokes an unstoppable reaction in the complex. Explosion after explosion, the tunnels begin to collapse. Seth leaves to find Peter Parker until Spider-Man sees him and returns the boy to his mother. Just as Spider-Man sends Joy and the Hanks off, the tunnel collapses trapping Spider-Man inside. Just as the others get to safety, the entire complex explodes. Soon the National Guard arrive on the scene and begin providing relief to the people of Temple Corners. As Joy gains her bearings she fears the worst and wonders what happened to Peter Parker. Not far away, the tatters of Spider-Man's costume is among the debris.

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