The article contains major spoilers for Avengers: Infinity War. Proceed at your own risk.
So a lot of major characters died or I should say vanished in Avengers Infinity War. This was something the audience was unable to believe. I mean with Spider Man Homecoming 2, Guardians of Galaxy 3 already announced, how could they kill the leads in those movies? So, we just got an idea that they all must be coming back. But how? To answer this question, we should go back to the basics.
Just like the previous 18 Marvel Cinematic Universe movies, Avengers: Infinity War was not so closely related to the comics. The story line was different, the cliffhanger of one was the beginning of the other and many more. However, there were much similarities between the two that could help us get an fair idea of what is going to happen in Avengers
PS:- Avengers 4 is rumored to have the title as Avengers : AfterMath.
The Infinity War movie is inspired from the 1991 comics, Infinity Gauntlet. The Marvel Comics, by Jim Starlin, George Pérez and Ron Lim, starts with Thanos already in possession of all the Infinity Stones. He snaps and BAMMM!! Half the universe is gone. But unlike the movie where this scene was a cliffhanger, it was just a beginning for the comics. This mass massacre calls up the heroes from across the universe and timelines to unite together to defeat the Mad Titan.
About 25 superheroes including Hawkeye, The Wasp, Fantastic Four, Luke Cage, Black Panther disappear due to the cosmic attack of the Gauntlet.
Captain America, Spider-Man, Thor, the Hulk, Iron Man, Doctor Strange, The Vision, Scarlet Witch and other characters like Doctor Doom, Wolverine are left to come together to plan out on how to take out Thanos. Unfortunately for us, MCU still doesn’t have the right to introduce Doctor Doom and Wolverine in their movies.
The Mad Titan with the possession of Infinity Gauntlet is just too powerful to be defeated by the mightiest Marvel Heroes. But he is betrayed by Death and Mephisto. This triggers his fury as he imprisons all of the entities and now seeks to rule the Eternity- the subconscious of every single living being.
Now, throughout the comics, Thanos torments his granddaughter Nebula ( in the movie she is the adopted daughter ). However, when the Mad Titan’s body is subconscious, and his conscious mind is out fighting the Eternity, Nebula seizes the opportunity and steals the Infinity Gauntlet off his hand.
But then an unlikely event happens. As soon as Nebula is about to take revenge from Thanos, Thanos is teleported to safety by Doctor Strange where Adam Warlock convinces Thanos to work together and stop his granddaughter.
The after story has been beautifully described in CBR,
“The Mad Titan manipulates Nebula into turning back the clock 24 hours, which leaves her in possession of the Infinity Gauntlet but resurrects all of those who died with the finger snap, and in the ensuing battle, leaving most of them with no memory of what took place. Nebula then defeats Doctor Strange, Thanos and the returning cosmic entities, but Warlock transports himself and the Silver Surfer to Soul World, where he exploits his link to the Soul Stone to generate “disharmony” among the other five, causing unbearable pain for Nebula, who’s forced to cast off the Gauntlet. A free-for-all ensues for control of the Infinity Gauntlet, only for Adam Warlock to reappear and claim it, assuring he will be “a god who can be trusted.”
However, with no Adam Warlock introduced in the MCU, we could assume it would be Captain Marvel who would be our Warlock for the movies.