Almost all things about Avengers 4 which will release 2019 is still shrouded in mystery. However, later a theory of fans appeared suddenly. Uniquely, the theory seems to show exactly how the future of the franchise Marvel Cinematic Universe, The new theory of fans circulating in cyberspace shows that the concept of time travel will play a major role in the Avengers 4 storyline, continuing the epic story of Avengers: Infinity War. 

A big fan speculates that a superhero might lose the battle at Avengers: Infinity War. Until Stephen Strange aka Doctor Strange (Benedict Cumberbatch) travels in MCU's timeline to save the members of Avengers, According to the theory, in the process later Doctor Strange will make subtle changes to the Marvel Cinematic Universe timeline, culminating in a small recycling sort for Avengers 4 and later.

This theory is also considered risky for some fans. Especially for those who worry about their favorite characters or actors removed from the MCU franchise. However, there is much evidence to support this theory, For example, photographs of Avengers 4 locations that had circulated, hinted the return of several major events. Including the comeback of the first movie The Avengers and Guardians of the Galaxy, The latest photos behind the scenes seem to hint at it. For example, Evangeline Lily who imitated her hairstyle from Ant-Man, Gwyneth Paltrow who returned using Iron Man 3 costume, and Scarlett Johansson who wore clothes from the opening scene Captain America: Civil War, Then, the players on the set were visiting the same outdoors places we've seen in MCU movies. There were also flashbacks of the 1940s and 1960s to some sort of funeral scene. 

Given all the evidence, it is not hard to imagine the passage of time playing a major role in Avengers 4. On the one hand, this tactic allows actors who want to leave the MCU franchise to do well, Small changes to this timeline can also make the major changes Marvel needs for Stage 4, bringing in a list of X-Men characters just gained from Fox, as well as some of the Spider-Man characters still in Sony's hands, Until now, it's all just speculation. Maybe all will be different and we only know after Avengers 4 released. Marvel fans are also expected to start getting answers when Avengers: Infinity War will appear in theatres on May 4, 2018. 

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