Earth-091991

Earth-091991 is the designated universe number for the Infinite Series Universe, a shared fictional universe which crosses over superheroes originally portrayed in film and television as product of Marvel Studios.

This universe is paralleled to Earth-199999, the original Marvel Cinematic Universe produced by Marvel Studios. Like the latter, it is home to multiple characters including Iron Man, Captain America, Thor Odinson, Hulk, Black Widow, Hawkeye, the Guardians of the Galaxy, Ant-Man, Dr. Strange, Spider-Man, and the Defenders, a few added exceptions, such as the X-Men and many others.

Overview
Earth-091991 has many of the features of our reality as well as Earth-2181: many of the same countries, personalities, and historical events. However, it also contains many fictional additions that have reshaped the world historically and developmentally. Super-advanced technology, and the interference of non-human races, sets the stage for a science fiction environment. A multinational policing agency in the form of S.H.I.E.L.D. has been created as a result of these things, preceded by the SSR. A select few people have also appeared who are more than human, such as mutants, Inhumans, mutates and many other otherworldly beings.

Super Heroes and Villains
The tradition of using costumed identities to fight (or commit) evil had long existed in this world, first by Nightshade in the late 1800s, Captain America following suite in 1940s, and then Iron Man in modern times. Earth-091991's major heroes (the ones who get involved in most of the important events) are Iron Man, Thor, Nightshade (who is than called Shadow), Captain America, the Hulk, Valor, and ex-S.H.I.E.L.D. agents Black Widow, Hawkeye and Dynamo.

These heroes became the original Avengers, the world's premier superhero team. There are also "street level" heroes who wage more personal wars in their own sphere of influence far from the globe-spanning activities of the Avengers, most of whom are part of the Gemini Network, an underground operation founded by Ayden Jaubert for this particular purpose.

Of course, as one would expect in a universe with superheroes, there would inevitably have to be crime and evil, and this universe is by far no exception.

Residents
See: Earth-091991 Characters

See: Earth-199999 Characters

Trivia

 * Earth-091991 was a last minute change on account to create a differentiation between of the Infinite Series Universe and the Marvel Cinematic Universe.
 * The universe of "origin" was initially going to take place on Earth-1999999.
 * All original MCU characters are the same.
 * Many of the Infinite Series ' creator's original characters are based either on live people or characters from other Earths and/or universes.
 * The backstory of most characters have been re-written and intertwined in a way that they are mostly all linked back to the original John Titor, Ayden Jaubert.