Avengers 4 will see Black Widow making the ultimate sacrifice to bring the group together, according to a new fan theory.
There have been plenty of Marvel fan theories floating around for Avengers 4 ever since Infinity War was released back in April.
The events of Civil War and Infinity War have left the Avengers fractured and defeated.
With that being said, the Avengers 4 fan theory suggests that Black Widow will sacrifice her life, possibly for the Soul Stone, which would then help to bring Steve Rogers and Tony Stark together.