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Marvel: Ultimate Alliance is a 2006 action role-playing video game, developed by Raven Software for the PlayStation 2, PlayStation 3, Xbox and Xbox 360, and published by Activision. The game was ported to the PlayStation Portable and Wii by Vicarious Visions, and to Microsoft Windows by Beenox. A different Game Boy Advance version was developed by Barking Lizards Technologies. A remastered version of the game was developed by Zoë Mode for Windows, PlayStation 4, and Xbox One, and was released in July 2016.

Ultimate Alliance is set within the fictional Marvel Universe and features many of the superheroes, supervillains, and supporting characters that appear in publications by Marvel Comics. It shares many similarities with Raven Software's previous Marvel titles, X-Men Legends and X-Men Legends II: Rise of Apocalypse, in that it allows players to select from its vast cast to create the ultimate superhero team. The game features an original plot in which the heroes of the Marvel Universe must join forces to defeat Doctor Doom and his Masters of Evil and foil their plans for global domination.

Upon release, the game was met with largely positive reviews from critics, who praised the simple but entertaining gameplay, and the impressive selection of iconic Marvel characters. A sequel, Marvel: Ultimate Alliance 2, was developed for multiple platforms by Vicarious Visions, n-Space and Savage Entertainment and released in 2009. A third game, Marvel Ultimate Alliance 3: The Black Order, was developed by Koei Tecmo's Team Ninja and published by Nintendo for the Nintendo Switch in July 2019.