At the end of Avengers: Endgame, Steve Rogers traveled back in time to return all six Infinity Stones to their original location. However, instead of returning to the present, he chose to remain in the past and live out a full life as Peggy Carter's husband. However, it was never made clear whether Steve's married life took place in the past of the regular Marvel Cinematic Universe, or if it took place in an alternate timeline created by his changing of events (co-directors Joe and Anthony Russo believe that Captain America created another branch reality, while screenwriters Christopher Markus and Stephen McFeely stated that Steve was actually Peggy's mysterious, unseen husband from Captain America: The Winter Soldier).
Now, in an interview with Canada.com, Markus and McFeely have doubled down on their belief that Steve is Peggy's Winter Soldier husband -- but they also make it clear that their theory doesn't necessarily fall in line with Marvel's.
"It depends on what story Marvel wants to tell going forward," McFeely answered. "I don’t know if Marvel wants to tell any more Captain America stories or if Chris [Evans] is up for it. Do they want to tell an alternate timeline story? Chris and I are partial to the idea that Steve is part of a strange, unique time-loop where he has always been there."
"The husband that you very purposefully did not see at Peggy’s bedside in Winter Soldier is Chris’ Steve. We have always thought that he was her husband. The movies you have been watching follow a line where he always goes back. To be fair, not everyone agrees with us. I don’t even know if Marvel agrees with us. But that’s what we think."
Directed by Joe and Anthony Russo, Avengers: Endgame stars Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Brie Larson, Paul Rudd, Don Cheadle, Karen Gillan, Danai Gurira and Bradley Cooper, with Josh Brolin as Thanos. The film is now available on Digital HD, Blu-ray and 4K UHD.