One World Under Doom (One World Under Doom #5)

Dormammu has come for Doom - and Doom has survived! Broken, depleted, but having bought the time he needed, Doom ensured that all of Earth's heroes would survive. These heroes now face a choice: they can allow Earth to fall to Dormammu - or they can align with Doom and fight for Earth beside him. Doom is at his highest - with Earth's heroes behind him, nothing can stop him now.

Nothing, that is, save for an unexpected return of an old foe...