Earth-838 was a reality alternate to Earth 616, first shown in Doctor Strange: Multiverse of Madness. On Earth-838, the existence of Inhumans such as Black Bolt and the Terrigen Mist has been known for some time, though for how long and in what capacity Inhumans have contributed to this Earth's history is unknown. Similarly, Mutants such as Professor Charles Xavier exist in the public on this world to an unknown capacity. At some point during World War 2, Peggy Carter underwent a dangerous procedure to become the "First Avenger", Captain Carter. Other residents of this universe included Maria Rambeau who became Captain Marvel, the Fantastic Four, Stephen Strange and Thanos.
