Endgame is one of the Marvel Cinematic Universe’s most iconic moments, but it originally played out very differently. In an interview with Empire (via Total Film) to promote his upcoming film The Electric State,

Avengers: Endgame saw Hulk putting on the Infinity gauntlet and snapping the blipped characters back to life. But unless the actual moment, nobody was sure how their return would be shown onscreen. Directors Joe and Anthony Russo claimed the portals scene underwent a lot of changes in the post production.

Endgame would play out as an adaptation of the comics. That film's final battle was still a visual treat, especially the Avengers assemble portals scene. Avengers: Endgame's creative team fought over two versions of the film's portals scene.

The portals scene was reworked in post-production (along with, famously, Robert Downey Jr'.s 'I Am Iron Man' one-liner) and the rest is history – even if Endgame writer Stephen McFeely freely admitted, "I thought the first cut worked pretty well."