This article contains spoilers for Doctor Strange in the Multiverse of Madness.
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.
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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
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