UNIVERSE 613
The Avengers plan out their Time Heist, using points from their past to pinpoint locations for the Infinity Stones: the Space, Mind, and Time Stones are found in 2012 New York, the Reality Stone in 2013 Asgard, and the Power and Soul Stones on Morag and Vormir respectively in 2014.
They split into three teams and travel back in time to begin their missions, mindful that they only have a finite amount of Pym Particles since Hank Pym also perished in the Snap.
Rogers, Stark, Banner and Lang arrive in an alternate 2012 in the midst of the Battle of New York.
Banner approaches the New York Sanctum and finds the Ancient One, who refuses to lend the Time Stone to him.
However, she relents after learning that Doctor Strange had given it away to Thanos in the future, fearing that it was done for a reason.
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At Stark Tower, Lang and Stark attempt to steal the Tesseract, and successfully obtain it. Rogers obtains the Scepter from STRIKE possession by feigning HYDRA affiliation.
But then the time of 2012 Captain America and Iron Man arrived, and in that fight, Loki using the Tesseract disappeared from there.
With only enough Pym Particles for one more trip each, Stark and Rogers decide to go back further to Camp Lehigh to an alternate 1970, where they have another shot to grab the more Pym Particles and Tesseract. Lang is left with the Scepter to return to the present day.
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Thor and Rocket Raccoon are also able to bring back the Aether, while he also brings back the Mjölnir of 2013.
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In 2014, Barton and Romanoff board the Benatar for Vormir, while Nebula and Rhodes remain on Morag and wait for Peter Quill to arrive and lead them to the Orb's chamber.
They knock Quill out and collect the Stone, but when the two attempt to travel back, Nebula is left behind when her memories are entangled with those of her past self.
—
The Thanos of that time uses the link to see into the future, learning that the same humans who had foiled his 2012 invasion are returning to reverse his ultimate victory.
Determined to know more, Thanos captures Nebula as she attempts to warn Barton and Romanoff of his newfound involvement. Past Nebula confronts her future self and collects her GPS and Pym Particles, handing it over to her father.
Meanwhile, Barton and Romanoff arrive on Vormir. They meet Red Skull, who informs them that the sacrifice of a loved one must be carried out in order for one to retrieve the stone.
Barton laughs at the concept, but Romanoff deduces that it is indeed the truth, as Thanos had murdered his daughter Gamora here in their time.
Understanding the severity of the situation, the two struggle to decide who should give their life for the cause; while Barton insists he should do it due to the carnage he left behind in the wake of his grief, Romanoff declares that her life's work has led her to this moment.
As they dash to the cliff, they wrestle to keep each other away from sacrificing themselves. Ultimately, Romanoff makes the jump and dies, leaving the Soul Stone with Barton.
—
The Avengers return to the present day, but unknown to them, the 2014 past Nebula returned with them, not the present Nebula.
"Did we get 'em all?" Bruce asked.
"Are you telling me this actually worked?" Rhodes asked, laughing.
But they noticed Clint's sad face, and one missing partner. "Clint, where is Natasha?" Bruce asked.
He was silent and everyone understands the she is dead, they started mourning for her.
"Who is in her family?" Tony asked Clint.
"Only we and Ethan Tennyson of William's Family?" Clint replied.
"What are you asking?" Thor shouted at Tony.
"I am only asking questions or nothing," Tony replied.
"Yeah, no, you're acting like she's dead. Why are we acting like she's dead? We have the Gems, right?" Thor argued with him, he continued, "As long as we have the Gems, we can bring her back. So, stop this shit. We're the Avengers. Get it together."
"We can't get her back. It can't be undone," Clint replied.
"Hahaha, look friend, I'm sorry, no offense, but you're just a small-minded archer. While I'm a space warrior. And you think I can't do something like this," Thor laughed as he explained.
"I know, I am talking about outside of my mind, but it can't be undone," Clint replied.
Banner throws a stool in anger, "She's not coming back. We have to make her sacrifice worth it," He said, everyone nodded.
Stricken with the loss of one of their own, they realize that her death cannot be undone, and that their efforts to save the universe must not leave her death in vain. They construct a new gauntlet and load the six Gems onto it. Thor attempts to volunteer to perform the snap, but Banner steps in due to the Stones' gamma radiation.
While severely scarring his arm, he successfully snaps his fingers and brings the victims of the Snap back to life.
Elsewhere, Past Nebula — who traveled to the present in place of her future self — opens a time portal, allowing Thanos to bring Sanctuary II forward from 2014. Which will come in 20 minutes.
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BEYONDER REALM
Ben's body has now shrinked back to his original size, as all of the massive energy was fitting inside him. In the four years of his rebirth process, Beyonder's will tried to fight with him in control of the body, but Ben easily handled him.
Because Ben has 28 years of experience of fighting, so how can a being, who has not even one years worth of experience understands the will of Ben Tennyson.
"Who are you? Beyonder or unknown being?" Kaizu asked, as all of the Beyonders came in front of Ben.
Since Beyonders has created the Cosmic Cube, in the four years they have also created some device which is able to control all of the Cosmic Cubes powers, if they have awakened the sentient.
"I am Ben Tennyson, but whatever, I have no time to waste with you," Ben replied, as he calmed himself and focused on the powers, which he gained from the Beyonder.
He feels his body power has grown thrice, but still Beyonder's powers were massive.
So his Omnitrix body has created a new alien, which has the full powers and abilities of the Beyonder. Which name Ben has decided, Beyonder X Alien.
"Ben, maybe you have no time to waste, but still you have closed the way of the Marvel Multiverse, which was our time pass. So we want you to open it," Himanzu put his demand to Ben.
"You have already whole Beyonder Realm for you all, you can create new beings and things here and make this place as your time passes, I will not allow any of you in Marvel Multiverse," Ben replied, then he whistled.
With his whistle, the Interstellar Harley returned back to him, he hopped on it, "Never try to entered in the Marvel Multiverse, or I will destroy the whole of the Beyonder Realm," Ben gives his last warning and opened a portal towards the Universe 613, while his body created the many of multiples, which goes towards the different Universes in Marvel Multiverse, where he lives previously.