After wrapping up the production on "The Baby-Sitters Club" in 2020, Gomez taped an audition for "Doctor Strange in the Multiverse of Madness" when she was only 13. The actress recalled that she wasn't even aware of the character she was auditioning for, as Marvel Studios kept details under wraps and used code names for all the characters. Since America Chavez was initially written to be a young adult, aged around 18, Gomez didn't get her hopes up and had forgotten all about the role once she sent in her tape. Gomez was surprised when she got a callback for another round of auditions a couple of months later. By then, fortunately, screenwriter Michael Waldron had revisited the character and reimagined America as a much younger version than previously planned. Gomez got called in for a screen test in London, after which she received a surprise call from casting director Sarah Halley Finn, informing her that she was the new America Chavez.
