Unlock All Characters:

At the character selection screen, press Select, Up, L2, R1, L1, R2. If you entered the code correctly, you will hear a sound. Everything will now be unlocked in cerebo mode and Boss characters will be playable.

Movie Costumes:

At the character selection screen, press Square when selecting your fighter to fight in their costume from the X-Men movie.

Boss Characters:

Beat the game with all characters to unlock all Boss characters.

Behind The Scenes Pictures:

Beat the game with all characters in their movie costumes to unlock behind the scenes pictures in cerebro mode.

Historical Comic Pictures:

Beat the game with all characters in their regular costumes to unlock their historical comic picture in cerebro mode.

Character Comic Pictures:

Beat ten rounds with any character in their regular costumes in survival mode to unlock their comic picture in cerebro mode.

Character Movie Picture:

Beat twenty rounds with any character in their movie costumes in survival mode to unlock their movie picture in cerebro mode.

Movie Pictures:

Beat twenty rounds with Gambit in survival mode to unlock movie pictures in cerebro mode.

Character Intro FMV Sequence:

Beat arcade mode with any character to unlock their intro FMV sequence in cerebro mode.

Intro FMV Story Style:

Beat the game with everyone and you'll get an intro FMV with everyones Intro FMV combined.

Outro FMV Sequence:

Graduate the Academy with any character to unlock their outro FMV sequence in cerebro mode.

Bonus Costumes:

Graduate the Academy with straight A's with any character to unlock their third costume. Press Circle to select the third costume.

Taunts:

Press Triangle + X (LK + HP) to taunt your opponent.