'Avengers:Endgame' fan theory reveals why 'Hulk' failed to bring 'Black Widow' back to life

It's been a year since "Avengers: Endgame" hit cinemas across the world and went on to and became the highest-grossing movie of all time, but there are still some mysteries enveloping the film hat fans are still trying to solve.

Digital Spy entertainment website recently reported that a fan theory is doing the rounds after someone questioned, "Did  Hulk visit the Soul World when he used the Infinity Gauntlet?"

The question is about a scene in which Hulk says he was unable to bring Shield Agent Natasha Romanoff/Black Widow back to life along with all those who died of Thanos' snap because he lost his life in different circumstances.

The theory suggests that Hulk knows this because he visited the "Soul World" after using the Gauntlet and met Natasha who told him the fact herself.