Marvel Ultimate Alliance 3: The Black Order

The Mad Titan Thanos and his Black Order - Corvus Glaive, Proxima Midnight, Ebony Maw, Cull Obsidian, and Supergiant - attempt to collect the six Infinity Stones in order to achieve galactic conquest. Originally guarded by Nebula and Ronan the Accuser, the Guardians of the Galaxy stumble upon their attempt to hide them from the group and end up accidentally alerting the Order to their presence. In desperation, Star-Lord uses the Space Stone to scatter the other stones on Earth, and to get him and his team to safety. As S.H.I.E.L.D. detects their presence, Nick Fury Jr. unites the Guardians and Earth's heroes to find them. Together they are able to retrieve the Time Stone from the Sinister Six led by Green Goblin during a breakout at the Raft, the Mind Stone from Ultron when he assaults the Avengers Tower, the Power Stone from the Hellfire Club and then again from the Brotherhood of Mutants, who briefly steal it during a Sentinel attack on the Xavier Institute for Gifted Youngsters, the Reality Stone from Dormammu in the Dark Dimension, and the Soul Stone from A.I.M. during an attack on Wakanda. Along the way, they help the Defenders retrieve an ISO-8 crystal from the Kingpin and face the Hand at Shadowland, stop an attempted coup d'état by Maximus the Mad at the Inhuman city of Attilan, and form uneasy alliances with Venom, the Brotherhood, Loki, and Thanos’ illegitimate son Thane.

When the Black Order find them in Wakanda, Thane gives himself and the Infinity Stones over to them to ensure the heroes' safety, but Proxima Midnight nonetheless teleports them to Asgard, where they face Hela and Surtur, as well as HYDRA, led by the Red Skull, defeating them with the aid of the Valkyrie, Odin, and Loki. Odin then transports the heroes to Knowhere where the Black Order and the Nova Corps are waging war. The heroes battle the Black Order and manage to retrieve most of the Stones, but as they prepare to clash one final time, they are stopped by Thane using the Time Stone. While Thane is distracted trying to choose a side, Thanos attacks him from behind and places the Infinity Stones in his Infinity Gauntlet, transporting everyone to his throne for a final battle. However, Thane, now completely corrupted by the power of the stones, takes the Gauntlet from him and uses the Infinity Stones' power to don the Infinity Armor, planning to kill his father to prove his superiority and the heroes if they stand in his way.

The group is transported into the Heart of Infinity, where the Infinity Stones were forged at the center of the universe, and the heroes aid Thanos in stopping the out-of-control Thane. Thanos reveals that the power of the Infinity Armor is too great for any mortal being, even Thanos himself, and pulls the gauntlet from Thane's hand, causing both to disappear and leaving the heroes and the Infinity Stones behind. Ebony Maw then attempts to take the Infinity Stones for himself, but is arrested by Richard Rider and the Nova Corps, as Richard plans to have him and the rest of the Black Order imprisoned at the Kyln. The heroes affirm they will be ready should Thanos ever return and agree to separate the Infinity Stones, hiding them in distant corners of the universe for safe keeping.

In a post-credits scene, a pair of eyes are seen above the Heart of Infinity.

Some time after Thanos and Thane's defeat, Doctor Doom attacks Wakanda, seeking the Soul Stone in Black Panther's possession. The heroes reunite to stop him, but Doom transports them to the Negative Zone so he can continue with his plans unhindered. The heroes are overwhelmed by the Negative Zone's native creatures Insectoids, but are rescued by the Fantastic Four. Together with the Fantastic Four, the heroes find Annihilus, the ruler of the Negative Zone, and defeat him, obtaining his Cosmic Control Rod and using it to open an inter-dimensional bridge gate to escape.

The heroes emerge from the gate in Latveria, discovering that many of its people have been absorbed into the Soul Stone. They make their way to Castle Doom, where Doom reveals that he is using his people's souls to resurrect a Celestial. The heroes defeat the Celestial, but Doom uses the cosmic power from the Soul Stone to transform himself into God Emperor Doom. The heroes ultimately triumph over Doom, freeing the souls of the Latverian citizens and reviving them. Afterwards, Mister Fantastic reveals that Doom's plans were meant to protect the universe from unknown entities awakened by Thanos and Thane's clash, and the heroes prepare to join forces yet again against this new threat.

The game's roster of playable characters combines many elements spanning all parts of Marvel media including the comics, the Marvel Cinematic Universe, animation and more in terms of visual design, roster choice, and voice cast members instead of relying on one source compared to some of the previous games such as Marvel vs. Capcom: Infinite, Lego Marvel Super Heroes 2 and Lego Marvel's Avengers. Specific members of the Avengers, the Guardians of the Galaxy, the X-Men, the Inhumans, the Defenders, Heroes for Hire, Marvel Knights, the Spider-Verse, and the Midnight Sons makeup the majority of the playable cast members. The Fantastic Four cast and additional members from Marvel Knights and X-Men, including one hidden final character are featured as paid downloadable content via the post launch Expansion Pass.[3][4] Additional characters were also added via free updates.

• ^a Playable character who also appears as a boss. Thanos' case, has his separate Infinite counterpart as a boss in the main story, prior to becoming a DLC playable character.
• ^b Available as a paid DLC playable character.
• ^c Originally a non-playable character, available as a free DLC character.