Just rewatched Avengers: Endgame, and I can't stop thinking about one huge “what if?” involving Steve Rogers, Peggy Carter, and the time-travel rules of the MCU.
What if Captain America(Steve Rogers) from Avengers: Endgame returns the Infinity Stones to their proper timelines and then travels back to the past, before Steve Rogers is discovered? What if 616 Steve retrieves his own frozen body from the ice and brings him back to Peggy, allowing Peggy to be with Steve Rogers, before 616 Steve returns to the main 616 timeline?