The red carpet premiere of Doctor Strange in the Multiverse of Madness included an appearance from Captain Carter actress Hayley Atwell. The star is known for portraying Peggy Carter in the Marvel Cinematic Universe, making her first appearance in 2011's Captain America: The First Avenger. She headlined two seasons of ABC's Agent Carter before her character passed away of old age in 2016's Captain America: Civil War. However, the What If... ? animated series brought Hayley Atwell back to voice Peggy Carter once again, establishing her as the super-soldier Captain Carter on an alternate Earth.