Doctor Strange in the Multiverse of Madness introduced viewers to America Chavez, played by Xochitl Gomez – a character who mysteriously existed in only one timeline. The multiverse lies at the heart of the MCU’s Phase 4 slate, and probably beyond. The Doctor Strange sequel played a crucial role in this, with Doctor Strange 2‘s post-credit scene revealing its hero unwittingly began an incursion – a multiversal collision. It further introduced the MCU to its first truly multiversal superhero, America Chavez.

Scarlet Witch became obsessed with America Chavez after she discovered the teenager has the power to jump between the universes. America’s powers are barely controlled – they were first triggered when she was stung, leaving her two moms stranded somewhere in the multiverse – but over the course of Doctor Strange in the Multiverse of Madness she grew in confidence and ability. It’s curious, though, that America is the only person currently identified who possesses these powers; even stranger, she revealed she has visited over 70 other universes, and has been unable to find a variant of herself in any of them. It appears that, in an infinite multiverse, America Chavez is unique.

The most likely explanation is that America Chavez is the MCU’s version of a “nexus being.” The term “nexus” was introduced to the MCU in WandaVision, where it was never defined; Loki attempted to clarify it, explaining the meaning of the term in relation to the structure of the multiverse, but that definition didn’t really fit with the prior context. It’s lifted from the comics, where nexi were defined as “rare individual entities with the power to affect probabilities — and thus the future. Such entities are like boulders and dams, altering the very flow of the time stream itself… These nexi are the very keystones of the multiverse – and are crucial to its ultimate coherence.” Later comics revealed only one nexus being can naturally exist in a dimension at a time, with Scarlet Witch herself serving as the nexus being of the main Marvel timeline. This rule explains why there seems to be only one America Chavez.

Scarlet Witch comics

It’s reasonable to assume America Chavez is the MCU’s version of a nexus being. While she doesn’t demonstrate probability-altering powers on a superficial level, Doctor Strange noted her journey through the multiverse was not as random as it seemed; rather, her jumps took her to just where she needed to be. This became particularly evident when she transported herself and Doctor Strange to Earth-838, a dimension with experience of the Book of Vishanti and a portal to help them get there. The odds of this happening are astronomical, suggesting America Chavez does indeed bend probability in the multiverse. Meanwhile, note that America Chavez’s presence in a particular branch of the MCU’s multiverse presumably prevents it continuing to branch off; otherwise, other variants of America would be created every time she made a decision. Her presence does indeed provide structure to the multiverse in some indeterminate way.

America Chavez’s powers fit the idea of a “nexus being” rather better than any character in the comics who has claimed that title. According to the Oxford English Dictionary, a nexus is “a means of connection,” a “tie” or a “link.” She has the ability to create portals between the dimensions – establishing temporary links between different timelines. If Doctor Strange in the Multiverse of Madness has indeed introduced America Chavez as a nexus being, then the definition makes a lot of sense.

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