Hulk couldn't bring her back because you can't use the power of the stones to resurrect her as the exchange is permanent, but when Cap goes back to return the stone he could exchange the stone back for her soul.
Although, for the Black Widow star, it seems very unlikely. In an interview on the Today Show, Johansson addressed recent rumors about a future appearance as Black Widow in the MCU: "I think it might be... I think it was the end, right?
As Clint said; there's no way to bring her back. It's because Natasha (Black Widow) wasn't removed by the gauntlet. She was used to retrieve one of the stones. The gauntlet was only used to bring back those removed by it.
Why couldn t they go back in time to save Natasha?
If the Avengers were to go back in time, get Natasha and bring her back, she would go on a separate timeline. Another movie that also explored a person “back from time” is Guardians of the Galaxy with Gamora.
Gamora was sacrificed by Thanos in the Infinity Timeline. Bc they went back to multiple dates before Thanos could even get to the stones, he never got to the point of sacrificing her for the soul stone, because Clint and Natasha went there first. So, Natasha simply ceased to exist in the original End Game timeline.
The Truth About Why They Can't Reverse This Endgame Death
Is Black Widow alive if the Soul Stone is returned?
In the end of Endgame, Captain America had to return the Soul Stone, but did that revive Black Widow? No. Red Skull does not say that returning the stone could revive the dead people. Gamora and Black Widow are still dead, and their heads were bleeding.
However, after Banner lost control of the Hulk and rampaged South Africa, he began to be wary of his place on the team and saw himself as more of a danger than a hero. Ultimately, the assumed explanation for a Bruce and Natasha relationship not coming to fruition was that it would simply never work.
Black Widow was one of the MCU heroes who survived Thanos' snap in Avengers: Infinity War, and seeing her fellow superheroes vanish during the Battle of Earth was a traumatic experience she carried for years.
Hulk later volunteered to wear the Infinity Gauntlet to counteract the effects of Thanos' snap, but was unable to bring Natasha back. In addition to bringing back the dusted, Hulk also attempted to resurrect Black Widow. However, he was positive she wasn't among the revived afterwards.
Black Widow sadly gave up her life to save others in Avengers: Endgame, and Hawkeye gave even more meaning to her Marvel Cinematic Universe death. In Hawkeye, Clint Barton's holiday plans with his kids get upended when Kate Bishop (Hailee Steinfeld) started wearing his old Ronin outfit while fighting criminals.
She is valuable to the extent that her pain can motivate them. In Endgame, Black Widow sacrifices her life so that Clint Barton, a.k.a. Hawkeye, can retrieve the Soul Stone, which will grant the rest of the Avengers the power to bring back everyone who died when Thanos snapped his fingers during Infinity War.
Who is the only avenger to be worthy of Thor's hammer?
Captain America
The first time, Cap merely returned the hammer to Thor, and the second occasion involved Cap grabbing the hammer after his trademark shield had been shattered in a big brawl. The MCU also had Captain America use Mjolnir in the final battle with Thanos, proving he was worthy to lift Thor's hammer.
Who is the woman with Yelena at the end of Black Widow?
This quiet moment is interrupted by Contessa Valentina Allegra de la Fontaine (Julia Louis-Dreyfus), who blows her nose and says she's allergic to the Midwest. Val has Yelena's next target: Clint Barton, aka Hawkeye.
Robert Downey Jr. confirmed that Iron Man 4 is indeed in the works. While negotiations continue for his return, this would mark his 7th appearance in a standalone Marvel movie and his 9th outing as Tony Stark in total.
In a world where emotion is used for exploitation and manipulation, Natasha's love for her sister makes her especially vulnerable. By looking for Yelena or sharing the truth about her past, Natasha would put herself in a bad tactical position.
The relationship between Bruce Banner and Black Widow was unique to the MCU. While their romance never really took off, it was clear they had feelings for one another, and those feelings made Natasha the only one who could calm down the Hulk - but her MCU lullaby doesn't work at all in the comics.
Bucky Barnes is one of the few figures who, while coming from the Red Room, Natasha trusts and cherishes. They first develop a romantic relationship when Barnes trains her as his Winter Soldier persona in the Red Room, though they are eventually split by their superiors.
Does Black Widow come back to life after end game?
Like with other fallen MCU characters, it's highly unlikely Black Widow will be brought back in the Multiverse Saga (and not even as a variant), but it's not too late for Marvel to make up for its Black Widow mistakes since Avengers: Endgame, and it has a brand-new chance to honor her legacy and give her the farewell ...
The original Avengers went outside the Compound, taking some time to mourn Romanoff by the lake. Thor suggested that they could use the Infinity Stones they had collected to bring her back, but Barton told them that, according to the stone's Guardian, she couldn't come back.
What does the end credit scene of Black Widow mean?
Black Widow's post-credits scene picks up following Endgame, with Yelena back in Ohio where she lived as a kid, as we saw at the start of Black Widow. She has a dog with her and she is visiting Natasha's grave.
Yelena goes to visit her sister Natasha's grave in a remote clearing in Ohio. According to Black Widow director Cate Shortland, the out-of-the-way location was inspired by Johansson's claim that, unlike Tony Stark, Natasha would abhor a massive public funeral.
Eventually, though, Natasha gets the upper hand on Clint for long enough to make her decision final, and go through with it. She leaps off the cliff, sacrificing her life for the Soul Stone. When the rest of the team emerges from their time travel escapades successfully, Clint returns with the stone—but torn apart.
