Theory 1: The Collapsing Universes Create Battleworld
In Jonathan Hickman's 2015 Secret Wars, Doom uses the power of the Beyonders to salvage dying realities, fusing them into a patchwork planet called Battleworld. We theorize that Doomsday will end with the destruction of the multiverse, leaving Doom as the supreme architect of the world entering Secret Wars.
Theory 2: The Spider-Man & Doom Emotional Climax
Peter Parker's grief and connection to Tony Stark is one of the emotional keystones of the MCU. Confronting a monstrous tyrant who possesses the exact voice, face, and cadence of his father figure will challenge Peter's resolve like never before.
Theory 3: The Council of Reeds vs The Council of Dooms
With Pedro Pascal's Reed Richards entering from an alternate timeline, the multiversal battle may escalate into a war of parallel intellects across infinite dimensions.

