With almost a two dozen movies, Marvel has done a convincing job when it comes to establishing characters in the story and summarising plot devices before last year's Avengers: Endgame. A true fan also is aware that all the Infinity Stones were well established over the course of many years and franchises. Except for one which was the Soul Stone.

While people knew about the origins of Power, Space, Reality, Time, and Mind from films such as Guardians of the Galaxy Vol 1, Thor: The Dark World, Doctor Strange, and Avengers: Age of Ultron, the soul stone was unheard of. During a recent watch party on Twitter, Russo brothers addressed the possibility of seeing the Soul Stone again in upcoming movies and outside of planet Vormir. 

While they did not reveal much about it, the Russo brothers told fans about their initial plans with the Soul Stone. "Early on in development talks, we considered making Cap the soul stone... But that idea fell away rather quickly. #AvengersAssemble," the tweet read. 

Fans made quite a few comments on Russo’s revelation. One said, "So you killed Nat instead. I see how it is. #BringNatashaBack," while another said, "I originally theorized that and am glad that it didn’t happen, he needed to be in the final battle BUT Nat should have lived. I’m not over that death #justiceforRomanoff." 

Avengers: Endgame turned out to be the most successful film ever made as it managed to reach box office figures touching $2.8 billion. Scarlett Johansson’s Black Widow was supposed to release this summer but its future remains uncertain amid the coronavirus pandemic.