>The movie would originally begin with Thanos destroying planet Xandar for the Power Stone. Glenn Close was set to reprise her role as Nova Prime Irani Rael, but the Russos felt it was redundant.
>The movie would originally feature the encounter and reconciliation between Captain America and Iron Man, but the Russos decided to leave it for AVENGERS: ENDGAME.
>Early drafts featured a voice-over narration from Thanos, and included much more of his backstory, including his childhood on planet Titan, the planet’s destruction, and how he recruited each member of the Black Order.
>Thor’s storyline went through multiple iterations, the most consisted one aside from the search for Stormbreaker being Thor venturing into the netherworld to ask the spirit of his grandfather Bor for guidance on how to defeat Thanos.
>The Russos wanted to keep Captain America out of the picture for as a long as possible to deprive the Earthbound heroes of their cornerstone. In many drafts, his first appearance would be the moment he rescues Vision from Corvus Glaive during the battle of Wakanda.
>Early drafts featured the Hulk bursting out of the Hulkbuster and joining the battle. The decision to scrap it in order to give Bruce Banner a victory entirely his own came so late into development numerous toys/artworks depicting the scene had already been produced.
>In some drafts, the movie would begin with Doctor Strange approaching Tony Stark and Pepper Potts at the park, with the attack on the Asgardians’ ship told through flashbacks.
>In some drafts, Captain America, Black Widow and Falcon would be introduced preventing terrorists from buying nuclear weapons in the Middle East before their appearance at the subway in Ireland.
>Many drafts featured Sharon Carter as the Secret Avengers’ contact and made clear Cap and her were in relationship.
>The Russos briefly considered featuring Adam Warlock in the movie.