The upcoming fifth and sixth Avengers movies, Doomsday and Secret Wars, will feature the Marvel returns of the Russo Brothers (Joe and Anthony) and Robert Downey Jr. Despite Endgame seeming like a bookend for them, Marvel courted them back.

"Really, what happened was we ended up stumbling upon an idea that activated all of us," Anthony Russo said. "You couldn't see it coming until it came, and once it came, it was like, 'Well, that's a story we need to tell.'"