Natasha Romanoff's fateful sacrifice in Avengers: Endgame may have been more crucial to beating Thanos than anyone realized, as one theory suggests. Also known as Black Widow, Natasha gave her life in order to retrieve the Soul Stone so her fellow Avengers could undo the damage wrought by Thanos when he culled half the population of the universe. Though the MCU films, including Endgame, continually failed Natasha as a character, she never once failed the Avengers, and potentially helped them win their biggest battle even after her death.
Scarlett Johansson's Black Widow, originally introduced to the MCU in 2010 with Iron Man 2, finally got her own solo movie, Black Widow, in 2021 — two years after she was killed off in Endgame. Set in the time between Captain America: Civil War and Avengers: Infinity War, Black Widow served as a frustratingly retroactive farewell to the character as well as a backdoor introduction to Yelena Belova (Florence Pugh), who is ostensibly Natasha's MCU replacement. Though her solo movie was good, it felt like too little far too late for one of the most important heroes in the Marvel pantheon and the only original female Avenger.
Related: How Black Widow Changes The Way You See Infinity War & Endgame
However, regardless of the issues with Natasha's story arc, it is undeniable that her sacrifice saved countless lives, and was truly heroic. Because of her, the Avengers are able to put the Infinity Stones back together and resurrect the half of the population that Thanos snapped out of existence. Additionally, according to one Reddit fan theory, Natasha's role in securing the Soul Stone may have also ensured the Avengers' victory over Thanos in the epic final battle at the end of Avengers:
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