Earth-9999

Earth-9999 is an alternate universe in the Marvel multiverse in which the villains Ultron and Apocalypse have both amassed large amounts of power, conquering large portions of the planet, and waging war against each other for total control, with the heroes stuck in the middle doing what little they can to save what's left of the world.

Ultron's Forces

 * Ultron
 * Jocasta
 * Vision
 * Tony Stark / Iron Man
 * Pepper Potts / Rampage
 * James Rhodes / War Machine

Prisoners / Test Subjects

 * Hank Pym
 * Nick Fury
 * Erik Lehnsherr / Magneto
 * Nathaniel Richards / Kang the Conqueror
 * Bruce Banner / Hulk

Apocalypse's Armada

 * En Sabah Nur / Apocalypse
 * Ororo Munroe / Storm
 * Salvator / Armageddon
 * Nathaniel Essex / Mister Sinister
 * Scott Summers / Cyclops
 * Alex Summers / Havok
 * James Howlett / Weapon Omega
 * Hank McCoy / Sorcerer Supreme
 * James Madrox / Multiple
 * Thousands of Mutants Serving in the Armada

The Five Horsemen of the Apocalypse

 * Warren Worthington III / Archangel / Death
 * Betsy Braddock / Psylocke / Conquest
 * Wanda Maximoff / Scarlet Witch / Pestilence
 * Johnny Storm / Human Torch / Famine
 * Cain Marko / Juggernaut / War

Human Internment Camps

 * Natasha Romanoff
 * Sam Wilson
 * Matt Murdock
 * Stephen Strange
 * Eddie Brock
 * Quentin Beck
 * Luke Cage
 * Ben Grimm
 * Scott Lang
 * Thousands of Other Innocent Humans

X-Men

 * Jean Grey / Phoenix
 * Emma Frost
 * Raven Darkholme / Mystique
 * Victor Creed / Sabretooth
 * Kurt Darkholme / Nightcrawler
 * Marian Darkholme / Rogue
 * Will Xavier / X
 * X-23 / "Laura"
 * Bobby Drake / Iceman
 * Piotr Rasputin / Colossus
 * Illyana Rasputin / Magik
 * Clarice Ferguson / Blink
 * Morty Tolensky / Toad
 * Grace Deacon / Spire
 * David Callahan / Incubator
 * Francesca Cortez / Leatherwings
 * Truman Valesca / Tecton

Avengers

 * Jean-Paul Beaubier / Captain Canada
 * Clint Barton / Hawkeye
 * Ben Reilly / Spider-Man
 * T'Challa / Black Panther / Venom
 * Janet van Dyne / Wasp
 * Reed Richards / Mister Fantastic
 * Susan Storm / Invisible Woman
 * Brunnhilde / Valkyrie
 * Kate Bishop / Ronin
 * Bobbi Morse / Black Widow
 * Shang-Chi / Iron Fist
 * Otto Octavius / Doctor Octopus
 * Hercules

Secret Warriors

 * Daisy Johnson / Quake
 * Kitty Pryde / Shadowcat
 * Pietro Maximoff / Quicksilver
 * Dante Pertuz / Inferno
 * Marilyn von Strucker / Aphrodite
 * Kamala Khan / Ms. Fantastic
 * Miles Morales / Arachnid

Other Heroes

 * James Barnes / Ghost Rider
 * King Namor
 * Steve Rogers / Captain America
 * Thor Odinson
 * Loki Laufeyson
 * Peter Parker / Spider-Man
 * Carol Danvers / Captain Marvel
 * Richard Rider / Nova

Guardians of the Galaxy

 * Peter Quill / Star-Lord
 * Gamora
 * Drax the Destroyer
 * Kamaria / Moondragon
 * Phyla-Vell
 * Subject 89P13 / Rocket
 * Groot
 * Mantis
 * Yondu Udonta