Doctor Strange in the Multiverse of Madness looks set to explore the MCU’s multiverse in the most detail yet, signaling the potential for a future franchise reboot. Although the MCU’s first real exploration of alternate realities came in Loki, the concept can be traced back as early as Phase 2’s Thor: The Dark World. Professor Erik Selvig, still affected by the influence of the tesseract, makes a subtle reference to the MCU’s multiverse theory with the words “616 universe” written on his blackboard – a nod to Earth-616, the main universe of Marvel comics. This was then expanded again in Doctor Strange when the Ancient One mentions the potential of multiple realities, telling Steven, “This universe is only one of an infinite number. Worlds without end.”
Despite these early references, much of the narrative development in respect to the multiverse has come post-Loki. The Disney+ series explained that the Time Variance Authority (TVA) has always been there to “prune” other universes, ensuring the maintenance of “the sacred timeline.” When Sylvie kills He Who Remains (aka Kang The Conqueror, played by Jonathan Majors) at the end of the first season, his sacred timeline breaks apart, releasing the full force of the multiverse into the MCU.
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Spider-Man saw the consequences of this in Spider-Man: No Way Home when the hero was confronted by a host of villains from other non-MCU Marvel franchises, but the trailer for Doctor Strange in the Multiverse of Madness suggests that the multiple realities could affect the MCU in a much larger way. The possibilities of the multiverse bring in the potential of a hard MCU reboot, and with actors finishing their
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