It's finally been confirmed that Captain Carter (Hayley Atwell) will appear in Doctor Strange in the Multiverse of Madness, as part of the MCU's Illuminati. Though she wasn’t in the first Doctor Strange 2 trailer, Captain Carter’s shield has been spotted on a Doctor Strange 2 poster and she appeared in the final Doctor Strange 2 trailer briefly.
Doctor Strange 2 is ultimately a curious choice for Captain Carter’s live-action debut after she was introduced in Marvel’s What If…? series. In the Disney+ show, the alternate universe version of Steve Rogers’ 1940s love interest established her own superhero career by receiving the vibranium shield and the super soldier serum. It would seem that after helping a team of heroes from the multiverse fight Evil Doctor Strange at the end of What If…? season 1, the character returns for another adventure as part of Professor X's Illuminati. Her coming back was no surprise, as it was already confirmed that Captain Carter would be in at least one episode of Marvel’s What If…? season 2, but her role in Doctor Strange 2 was kept a well-guarded secret for quite a while.
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Captain Carter appearing in Doctor Strange in the Multiverse of Madness also nowraises the question of exactly how What If…? fits into the equation. First of all, Captain Carter being in the movie would confirm that the show’s greatest marketing promise was true all along. It was said from the beginning that What If…? was vital to the MCU’s overarching story and its future. Considering that the show is an animated series, there were some lingering doubts about its significance. However, footage for Doctor Strange 2 hints that What If…? was much
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