Marvel Masterworks: The Fantastic Four #10

When the Fantastic Four entrust their infant son to the care of the powerful sorceress Agatha Harkness, their quiet moment is shattered by the sudden return of the Frightful Four. Though the villains strike with menace, Agatha proves more than a match for them, effortlessly turning their attack aside.

In "The Strength of the Sub-Mariner," Prince Namor of Atlantis, the Sub-Mariner, finds himself at a crossroads when he saves the life of the villainous mutant Magneto—only to face a bitter betrayal. When Magneto fails to sway Namor to his cause, he sets in motion a dangerous scheme that pits the Atlantean prince against the Fantastic Four, igniting a full-scale war as Atlantis prepares to unleash its might upon New York City.

In "At War with Atlantis!", the Fantastic Four race to prevent a global conflict between the U.S. and the underwater kingdom of Atlantis, only to uncover a sinister manipulation by the mutant mastermind Magneto. With Invisible Girl and Namor’s beloved Lady Dorma taken hostage, Magneto seizes control of the Atlantean forces and launches an assault on New York.

In "Our World — Enslaved!", Magneto, now commanding the Atlantean army, lays siege to New York City, taking Sue Storm and Lady Dorma hostage to force Namor and the Fantastic Four into submission. With the fate of both surface and undersea worlds hanging in the balance, the heroes must outthink their enemy using a daring device crafted by Mr. Fantastic—turning Magneto’s own power against him.