Thanos has proven to be the villain.
At the end of Avengers: Infinity War, the crazy Titan eliminated half of the existence with a snap of his fingers.
The result was the loss of many beloved superheroes, with the surviving Avengers charged with defeating him and resurrecting his friends.
The Avengers 4, without a doubt, will see how these missing heroes return, although it remains to be seen.
Could these eight villains replace Thanos in Avengers 4?
These nine villains could be bigger and worse than Thanos in the final chapter of Phase Three.
Fans waiting for a crossing of the Fantastic Four will be more excited about the possibility of Galactus being the next villain.
A god, Galactus is for the most part indifferent to human existence, in the same way that a human can be indifferent but slightly annoyed, by a fly.
He has tried to destroy the Earth several times only to be defeated by Reed Richards, but if a crossing took place, who knows what destruction could occur on the planet.
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Avengers: Galactus, Kang the Conqueror and Annihulus are powerful Marvel villains.
Kang the Conqueror
With access to time travel, you never know when Kang the Conqueror may appear.
Since time travel is said to be a large part of the Avengers 4, Kang can appear to do some damage on his own.
Incapable of compassion, remorse or sympathy, Annihilus, ruler of the kingdom of the Negative Zone of chaos, may be the villain most likely to appear in the Avengers 4
He is the main villain at the crossroads of Marvel Annihilation, and if you've been paying attention to the latest leaks, the likely title of The Avengers 4 is Avengers: Annihilation …
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Avengers: It is rumored that Mephisto and Shuma-Gorath appear in Doctor Strange 2
One of the two villains, whom some speculate that Doctor Strange may face in his sequel, Mephisto is as close to the Devil as the Marvel Cinematic Universe.
Mephisto has been present in the comic verse for 50 years, and it's about time he has a film debut.
The second of Dr. Strange's alleged enemies in the upcoming solo movie, Shuma-Gorath is a giant eye surrounded by tentacles and is an interdimensional being of infinite power.
The main motivation of Shuma-Gorath is simply to bring chaos, death and destruction; It sounds good to a Marvel villain.
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Hate Monger and The Shadow King: the latter is currently a villain in the television series Legion
Hate Monger can be the wet and moving villain of our time; He embodies the ideas of hatred, and ideas are impossible to kill.
He has been a constant threat to both the Fantastic Four and Captain America, so, regardless of a crossover in the future of Marvel, Hate Monger could appear in future MCU films.
The king of the shadow
Anyone who watches the TV series Legion will recognize this villain.
Although the film universe is unlikely to withdraw from its television canon, you never know who the body of the Shadow King will be.
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The Brood: Marvel could use The Brood, based on the movie Alien, as his new villain
The Brood are directly inspired by the Ridley Scott film, Alien, and were created for Uncanny X-Men # 155 of 1982 by Chris Claremont and Dave Cockrum.
Although a little more terrifying than Scott's villain, The Brood implants its victims with eggs that take the body of their host and transform the victim into a new Brood. Horrifying.
Any of these villains could appear in the last installment of Phase Three, or even appear as enemies in Phase Four, in charge of Captain Marvel.
Only time will tell.
Avengers 4 goes on sale in theaters on April 26, 2019.