IMPORTANT!!! A small hotfix has been released. See the bottom of this post for more information.
Click on the picture to download. MAKE A BACKUP OF YOUR HEROSTAT.ENGB
Size: 53.76mb
Contains every character that appeared in any version of Marvel: Ultimate Alliance:
The Next-Gen exclusives: 
Colossus and

Moon Knight (including an exclusive fourth skin for Moon Knight)
The Xbox 360 Gold Edition Characters: 
Cyclops,

Hawkeye,

Hulk,

Nightcrawler,

Dr. Doom,

Magneto,

Sabretooth and

Venom
The PSP exclusives: 
Black Widow,

Captain Marvel and

Ronin (Hawkeye is counted in the 360 characters)
Also includes: Heroselect, a great program that will allow you to swap out characters. (there is a max of 27 characters in-game)
Colossus, Hawkeye, Hulk and Moon Knight come pre-installed. Use Heroselect to swap them out if you wishKnown Bugs/Issues:-Doom's sounds are still slightly buggy. Some don't loop correctly, and the timing isn't perfect yet (to be fixed in the final release)
-Ronin is still missing two skins
-Doom and Ronin have no Xtreme yells (I accidentally overwrote Ronin's a long time ago, and Doom's from the trailer sounds horrid in-game)
-You must have particle settings on high to view certain effects
-Nightcrawler's first outfit doesn't match the mannequin. Will be fixed in a small patch for those who can't fix it themselves
Updates since the last release:-Dr. Doom and Venom now included
-Hulk now has sounds
-x_voice updates (you'll now hear menu callouts and goodbye sounds for all XML1/2 characters + the ones in this pack)
-Posed Hawkeye, Hulk and Nightcrawler mannequins
-Re-converted PSP sounds
-Black Widow update - new models, boltons, and mannequin, fightstyle
-Nightcrawler's boltons updated - he'll have swords on his back for all of his skins
-Updated herostat.cfg
Credits:-Raven Software/Vicarious Visions: The original games (Vicarious Visions did the PSP port)
-Neversoft: For Venom's voice (from the PS1 Spider-Man game)
-THX: for the hosting of this site
-BliZZ: for heading up the mod, and doing the bulk of the conversions
-Tommyboy2002: for the Captain Marvel, Hawkeye, Hulk and Ronin models + Dr Doom mannequin
-Dark_Mark: Venom and Magneto models/mannequins + Sabretooth mannequin
-Iammingy: For incredible skins, fixing of effects, new boltons and the Black Widow update
-Norrin Radd: For the additional 3 Dr Doom skins, the Original Sabretooth skin and other misc
-Winstrol: for ZSMEditor, without which we wouldn't have sounds
-Teancum: Character sounds, compiling of beta 3
-Overload: For the posed Cyclops, Hawkeye, Hulk and Nightcrawler mannequins
-Burning Rage, darkmythology: initial 360 conversion research
-Anyone else I forgot: Thanks
Installation Instructions: (thanks Iammingy)
The file you download, OfficialCharacters_beta3.exe , is a self-extractable executable that automatically extracts its content into various folders.
To install the mod correctly:
1. Back up your files!!! It will overwrite your herostat and other files!!!
2. Place OfficialCharacters_beta3.exe in ..\Activision\Marvel - Ultimate Alliance
3. Double click on OfficialCharacters_beta3.exe and click "Extract".
4. If it asks you to "confirm file replace", click "Yes to all", assuming that you have backed up your files already!!! If you haven't backed up your files, then click "No to all" and back up your files now!!!
5. Let it run for a bit.
6. After it's done extracting, the mod is ready for playing.
7. The default herostat contains Colossus, Hawkeye, Hulk and Moon Knight. You can swap in other characters with Heroselect. You can find the herostat entries of other "Official" characters in herostat.CFG from the "heroselect" folder.
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NOTE: If you don't already have Official Characters Beta 3 installed, do that first, THEN install the hotfixBeta 3 Hotfix (1.67mb)
-Fixes issues with Nightcrawler's bolton
-Makes Nightcrawler's first skin match the mannequin
-Updates Dr. Doom to most recent version
2. Place OfficialCharacters_beta3.exe in ..\Activision\Marvel - Ultimate Alliance
3. Double click on OfficialCharacters_beta3.exe and click "Extract".
4. If it asks you to "confirm file replace", click "Yes to all"