OMG guys idk if you already knew this mod, which is called "Marvel Ultimate Alliance: The Expansive Game" but it adds a lot of stuff:
Also there's this web series called "Marvel Ultimate Alliance: The Expanded Univerese" which is based upon this mod, and aims to be the definitive experience to Marvel Ultimate Alliance's Storyline, with unique dialogues and exclusive characters and also restored Cut Content, a big part of that was made by the mod, but the guy here created some storyline on the cut content that the mod didn't touch, infact in the last episode the HUB is the Baxter Building:
They also made a connection with X-Men Legends II: Rise of Apocalypse" connecting both the series. Idk if the modders plan to do smt similar with UA2 or even 3 so that they can attempt to connect it into the series cos this is super cool.
I just wish this was official.
Also P.S. Did you knew that Doctor Doom from the 1st game is actually Doom from the future, and the one you can play is Present Day Doom?