Along with the other new features that will arrive in the new Fantastic 4: Shadows of Doom DLC, other new outfits from the Guardians of the Galaxy and Thanos are also incorporated. In this case, the alternate costumes of Gamora, Star-Lord, Groot and Rocket are based on the «Conquest» version, which is mostly seen in comics and animated series. On the other hand, Drax receives the version of "Thanos Imperitive" and Thanos that of "Annihilation".
Recently Marvel Games has announced the news through its official Twitter, where it has also shown the images of each of the new suits
Relive the iconic events that united the space-faring team we know as the Guardians of the Galaxy in these free costumes landing in Marvel Ultimate Alliance 3: Shadow of Doom on 3/26! @NintendoAmerica # MUA3 pic.twitter.com/2b0g4zpPeq
– Marvel Games (@MarvelGames) March 21, 2020
With this in mind, there would be 15 characters from Marvel Ultimate Alliance 3 who will receive new alternative outfits. The Fantastic 4: Shadows of Doom DLC will be available from March 26, if you have not yet obtained it, you can get it on Nintendo eShop.