Thanos' universe-altering 'Snap' originally wasn't always planned to be the culmination of Avengers: Infinity War but instead could've been the big opening of Endgame, according to co-writer Stephen McFeely.
"We had so much story in those early drafts of Infinity War that, if anything, we thought we maybe shouldn’t do the Snap until the end of act one of Endgame,” McFeely told Empire.
McFeely, who wrote the film with Christopher Markus, said it was Marvel Studios President Kevin Feige who pushed for them to have it as the big Infinity War finale.
"We talked about that ending for years and years and years," McFeely continued. "It was the reason to adapt Infinity Gauntlet. What was the most shocking thing we could do? End the movie with the Snap."
Avengers: Endgame opens in theaters April 26.