Thanks to the events in Loki, the Marvel multiverse has arrived in the Marvel Cinematic Universe. How this all plays out remains interesting, with the next Doctor Strange movie dealing with it as well as possible fallout in the next Spider-Man and Ant-Man movies as well.

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While fans dream of the X-Men and Fantastic Four arriving thanks to the possibilities, the ideas of different Earths could play into the entire MCU's Phase 4. With the possibility of different Earths explaining the Fox heroes, as well as others to bring in names like Miles Morales, Marvel Comics has plenty of important multiverse worlds to focus on as well.

Earth-295: The Age Of Apocalypse

The Marvel mutants fighting in Age of Apocalypse comic book.

One of Marvel's most important multiverse worlds came in the pages of X-Men comics. This is the Earth from the "Age of Apocalypse" story. Professor Xavier's son Legion created this reality accidentally when he tried to go back in time to kill Magneto but killed his father on accident. With no Professor X, Apocalypse conquered Earth.

First appearing in X-Men Vol. 2 #40 by Fabian Nicieza, Andy Kubert, and Ron Garney, this world eliminated most superheroes before they ever existed. Characters that escaped from Age of Apocalypse included X-Man, The Dark Beast, Sugar Man, Holocaust, Blink, and a new version of Sabretooth.

Earth-9200: Maestro

Maestro rules the world in Marvel Comics.

Earth-9200 was the world where a nuclear apocalypse created one of the most powerful versions of Hulk, a ruler known as Maestro. In this multiverse world, Hulk believed he was a hero and was married with children, but he woke from this dream and realized M.O.D.O.K. had kept him in suspended animation after humans destroyed the Earth in a new world war.

Hulk realized quickly that he was better suited to rule this world than the humans, so he killed Hercules, who had become a benevolent ruler, and then forcefully conquered Earth. He became extremely powerful and it wasn't until the 616 version of Hulk arrived that he was finally stopped.

Earth-2149: Marvel Zombies

The infected Marvel Zombies attacking.

In 2005, Mark Millar and Greg Land created Earth-2149, which ended up known as Marvel Zombies. This world saw a zombie plague sweep across the Earth and no one was safe, not even the superheroes. Soon, all the heroes became zombies, except for a select few who remained to fight them and defend humans.

This world of zombies was more powerful than anyone could have imagined, since they maintained a sense of their intelligence but still demanded to feed on others. They even killed Galactus and stole the Power Cosmic when they ate him, eventually setting out to eat other worlds until there was nothing left.

Earth-TRN852: Heroes Reborn

The Avengers vs Squadron Supreme in Heroes Reborn.

Earth-TRN852 was the most recent multiverse world to form in Marvel Comics. This was the world of Heroes Reborn, which Mephisto created for Phil Coulson, who became the President of the United States. In this world, The Avengers and other heroes never existed, nor were they needed.

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The Squadron Supreme were the Earth's heroes, defeating every villain who threatened the Earth and sending all supervillains to the Negative Zone. However, Blade knew the truth and found and dethawed Captain America to help him return Earth to the 616-timeline.

Earth-807128: Old Man Logan

Wolverine in Old Man Logan.

Earth-807128 was the multiverse world where Old Man Logan came from. This world, which influenced the movie Logan, saw Wolverine tricked into believing the X-Men were villains and he killed them all. When he realized what happened, he retired and went into hiding. This allowed villains to conquer the Earth.

Old Man Logan wasn't the only hero to have a role in this world. Hulk became a villain and ruled his own part of the country. Old Man Hawkeye was around, although blind. Even Old Man Quill showed up back on Earth to see what had become of his home planet.

Earth-811: Days Of Future Past

Wolverine protecting Kitty in Days of Future Past.

Earth-811 is one of the most famous alternate Earths in the multiverse. This is the timeline where the Sentinels hunt down and either killed or enslaved all mutants and then went on to destroy countless humans as well. One of the most successful X-Men moviesDays of Future Past, was a loyal adaptation of the storyline, which showed how hate and prejudice could destroy the world.

Rachel Summers was one of the main heroes who came to the main timeline from the "Days of Future Past" multiverse world. This is the future that most X-Men point to when warning the world about what hate and fear can cause.

Earth-982: MC2 Earth

The heroes of the MC2 Earth.

Earth-982 was such a popular multiverse world that it received its own comic book line to allow the heroes to develop. This came originated in the Age of Heroes, where a What If...? story had the Fantastic Four gain their powers 15 years earlier than in Marvel-616. This means this is the second generation of heroes.

Peter Parker and Mary Jane's daughter is Spider-Woman. Shannon Carter was the American Dream. Ben Reilly's son was the new Daredevil. Wolverine and Elektra even had a daughter known as Wild Thing.

Earth-58163: House Of M

Magneto and his family ruling in House of M.

There was a miniature version of Earth-58163 in WandaVision. This was the alternate Earth that Scarlet Witch created after realizing she had children once and they were erased from her mind. In one of the worst things Scarlet Witch has ever done, she killed several Avengers and then created a new world. This was House of M, where mutants lived in peace with the rest of the world.

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This world saw a mutant vs human war that the mutants won and ended up living in a Mutant Utopia. finally finding peace. However, soon Wolverine realized something was wrong and this world of mutant peace would never last.

Earth-1610: Ultimate Marvel

The heroes of the Marvel Ultimate Universe.

The most popular and well-known Earth in the Marvel multiverse was Earth-1610. This was the Ultimate Marvel Universe. In 2000, Brian Michael Bendis, Bill Jemas, and Mark Bagley created this new Earth where the complicated backstories of all superheroes and villains were reset in a more modern setting.

The Avengers became The Ultimates, Spider-Man was a teenager again, The X-Men were once again persecuted, and most deaths in this world stayed dead. This world was hugely popular and gave the world Miles Morales before dying in the Incursion.

Earth-15513: Battlerealm

Doctor Doom ruling over Battleworld in Secret Wars 2015 comic.

The Incursion was an event that caused all the multiverse Earths to collide and destroy everyone in that world. The last two standing were Earth-616 and Earth-1610. These two Earth's heroes battled in a Marvel multiverse war to save their world but they collided and ended up destroyed with nothing remaining.

However, out of this incident, Earth-15513 rose. This was Battlerealm and the story was told in Secret Wars. Doctor Doom became an "Emperor" and all Earth's heroes took on strikingly different roles. This ended with Doom vs. Reed Richards and led back to an all-new Earth-616, which also featured touches from Earth-1610.

NEXT: Loki: 10 Best Marvel Multiverse Memes