Avengers: War is a fighting video game based upon the fictional universe of Marvel Comics. The game was developed by NetherRealm Studios and published by Disney Interactive Entertainment for the PlayStation 3, Xbox 360, and Wii U. It was released in April 2013 in North America, Europe, and Australia, and June 2013 in Japan. An expanded version of the game, titled Avengers: War Ultimate Version, was released in November 2013 for the PlayStation 3, PlayStation 4, PlayStation Vita, Xbox 360, and Microsoft Windows. A free-to-play mobile app based on War was also released for Android and iOS devices. A prequel comic book series of the same name, written by Tom Taylor, was released beginning in January 2013.
In an alternate universe, Bullseye tricks Iron Man into killing his pregnant wife Pepper Potts, which detonates a nuclear weapon that destroys New-York and kills millions. Driven over the edge by this, Iron Man kills the Bullseye in retaliation. Now corrupted, Iron Man takes drastic measures to "save" the world, forcing people to follow his will and killing those who resist. He becomes a ruthless dictator who would kill criminals as he deemed fit and establishes a totalitarian world government named the One Earth Regime that eliminates crime and erases civil liberties. Iron Man leads the regime as its High Councillor alongside several Avengers members and villains who serve as his lieutenants. Now viewing Iron Man as Earth's greatest threat, Daredevil establishes an Insurgency of heroes against his tyrannical regime. A war breaks out between the two factions, ultimately leaving the Avengers disbanded.
Five years into Stark's regime, the Insurgency discovers a parallel universe where Bullseye's plan failed, and they teleport that world's Thor, Namor, Hawkeye, and Captain America into their universe. Daredevil and Bullseye are accidentally transported as well, but are separated after an encounter with the Regime's military forces. While searching for somewhere to recharge his powers, Captain America encounters Baron Zemo and his own Hydra counterpart. The alternate Namor fights his counterpart as well upon discovering that his counterpart has agreed to provide Atlantis' army to Iron Man.
The real-universe heroes eventually meet the Insurgency Daredevil in Hell's Kitchen. Daredevil and Justin Hammer, an Insurgent mole inside the Regime, explain that a nanotech pill derived from Hulk DNA can make regular humans thousands of times stronger and more resilient, as well as their plan to use a paladium-based weapon stored in the Daredevil's Cave against Iron Man. DNA samples from the Iron Man are needed to unlock it, but, in their universe, most core Avengers were either recruited or killed by the Regime. Meanwhile, the alternate Daredevil pursues Bullseye through Hell Kitchen, but Captain Hydra and Wolverine (Itsu) mistake him for their own Daredevil and arrest him. The Bullseye then reunites with the Typhoid Mary of this world, who founded an underground organization called "Bullseye Clan" in his memory, but is otherwise allied with Daredevil's Insurgency. After helping the Bullseye Clan fight off a Regime attack (including Wolverine and Blindspot,) at Raft, the Insurgents sneak into Matt Murdock house, where they fight off Regime enforcers. The heroes are able to enter the Daredevil Cave and retrieve the paladium weapon, but they are attacked by Ronan and Regime Thor. The Insurgents repel Ronan, but not before he damages the weapon.
In the real universe, the remaining heroes, including Iron Man, Patriot, and The Quicksilver, attempt to recover their comrades. Their teleporter sends Patriot into the Insurgency's universe, where he joins their efforts and works with Taskmaster to commandeer the Regime Cosmic Base's teleporter. At the same time, Daredevil and Hawkeye stage a break-in on Ryker's Island to rescue the prime Daredevil. Captain America, Thor, and Namor (commandeering an army of sea creatures) launch an attack on Ryker's Island to distract the Regime. Iron Man attempts to destroy the Cosmic Base, but fails when Taskmaster overcharges its core, setting off a massive explosion. Hammer tries to use the paladium weapon to kill Iron Man, but Carol Danvers stops him, allowing Iron Man to execute him. Now aware of humanity's determination to depose him, Iron Man decides to destroy Hell Kitchen and New York to demonstrate the chaos that would arise in his absence and invade the heroes' other universe as punishment for interfering. When Carol protests, Superman murders her, causing Quicksilver to defect and fight his way to the Insurgency and inform them of the Regime's plan.
The real universe Daredevil convinces his counterpart to recruit the Iron Man from his universe. When open war between the Regime and Insurgency erupts, Ares teleports the real universe Thor to Asgard and reveals that Iron Man plans to have the Asgardians invade New York. After defeating her counterpart, Thor convinces the Asgarduans to fight Iron Man instead. An army led by Namor attacks New York, where the insurgents and the Asgardians fight them off. The real universe Iron Man defeats his counterpart's powerful Regime enforcers, including Fin Fang Foom, and engages in a confrontation against his counterpart at the Stark Tower. Despite Iron Man's claims to have saved the Earth through his regime, the good Iron Man tells his counterpart that Pepper would be afraid and disgusted by what he has become and that her death does not warrant or justify his subsequent actions. He proceeds to face his dark counterpart in a final battle where he emerges victorious, ending the reign of the One Earth Regime.
After the High Councillor's downfall and the Regime's defeat in New York, the Regime is dismantled and all of its accomplices are detained. Typhoid Mary has the Bullseye sent back to the real universe after realizing that he does not care about her. The dictator Superman is placed in a prison cell emitting radiation that renders his symbiote costume powerless. As he and Daredevil discuss the recent turn of events and the immediate future, the real universe Iron Man admits his fear that he could go down the same dark path if he suffered the same tragedy the now-former High Councillor did. As Daredevil and Iron Man walk away, the former High Councillor's eyes glow red, indicating his symbiote still has some degree of his powers.
- Namor - prince of Atlantis. One of the Regime characters.
- Nuke - Daredevil villain. One of the Regime villains.
- Ares - God of War. Neutral character.
- White Tiger - superhero. DLC character.
- Daredevil - blind superhero. Leader of the Insurgency.
- Ronan - Kree Accuser. Member of the Regime.
- Elektra - Ninja warrior. Member of the Regime.
- Patriot - Former Avenger. Currently Regime member.
- Taskmaster - Assasin for hire. Member of the Insurgency.
- Fin Fang Foom - Monstrous dragon. Mind-Controlled by Iron Man.
- Quicksilver - Former Regime member. Currently member of Insurgency.
- Hawkeye - Superhero and Insurgency member. Died before the game started.
- Captain America - Regime and Hydra member.
- Typhoid Mary - Bullseye's fianceé. Leader of the Bullseye Clan.
- Itsu - Regime member and warrior called Wolverine.
- Bullseye - Daredevil villain. He exploded New York and tricked Iron Man to kill Pepper Potts.
- Emma Frost - Supervillain. Regime member.
- Justin Hammer - Iron Man villain. Insurgency member. Killed by Tony Stark.
- Deadpool - Anti-Hero. DLC character.
- Vision - Avengers member. DLC character.
- Blindspot - First Blindspot was Daredevil partner and superhero. Second, was Regime member.
- Wiccan - superhero and Regime member. He have magical powers.
- Captain Marvel - Regime member. She was killed when tried to protest Iron Man.
- Baron Zemo - Hydra and Regime member.
- Hulk - Giant mutated superhero. Regime member.
- Iron Man - Former superhero. Regime leader.
- Thor - Regime member and Asgardian prince.
- Scarlet Witch - superhero with magical powers. DLC character.
- Mandarin - Iron Man villain. DLC character.
Additionally, several characters are playable as alternate skins for existing characters. They include:
- Daredevil 2099 (Daredevil skin)
- Jack Murdock (Daredevil skin)
- Iron Monger (Iron Man skin)
- Wizzer (Quicksilver skin)
- Falcon (Captain America skin)
- Shadowcat (Itsu skin)
- Blindspot (Jackie Murdock) (Blindspot skin)
Lastly, some characters and alternate skins are exclusive to the iOS and Android mobile app.
- Mister Raft - Frank Castle. Daredevil villain.
- White Tiger (Angela del Toro) - Second White Tiger. Superhero.
- Thanos - Cosmic titan and supervillain.
- Death's Stalker - Daredevil supervillain. Demonic ghost.
- Quicksilver (Tom Shepherd) - Second Quicksilver and Young Avengers member.
- Nova (Lindy Nolan) - Superhero. Nova Corps member.
- Gladiator - Melvin Potter. Daredevil supervillain.
- Speed Demon - Quicksilver supervillain.
- Darkhawk - young superhero.