With all the time travel involved with Avengers: Endgame, a true can of worms has been opened, along with an entire multiverse. One of these alternate realities could also have significant ramifications for the McU.
Joe and Anthony Russo, the directors of Endgame, have confirmed to Business Insider that because Loki stole the Tesseract and then disappeared, this has created another reality that never should have existed. Joe said about Captain America’s mission:
“The intent was that [Steve] was going to correct the past timelines at the point that the stones left. Loki, when he teleports away with the Time Stone, would create his own timeline. It gets very complicated, but it would be impossible for [Cap] to rectify the timeline unless he found Loki. The minute