Storm / The Apocalypse
[Submitted by: Cheat Masters ]
Defeat the door machine and the Four Horsemen. You need Storm to be adequately powered to shoot lightning at range for this. When fighting Apocalypse, switch to Storm and fly up to the pole and stay there. She can blast Apocalypse but he can not hurt Storm so you can easily beat him. Good Luck!

Professor X
How to unlock: Finish all of the the danger room missions.

Age of Apocalypse Costumes & original Scarlet Witch costume
How to unlock: You must finish Act II.

Cheat: God Mode
Go to the Pause Menu and enter DOWN, UP, DOWN, UP, RIGHT, DOWN, RIGHT, LEFT.
Then push START.

Unlockable: Age of Apocalypse Costumes & original Scarlet Witch costume
You must finish Act II.

Civilian costume for Storm, Cyclops, & Wolverine
How to unlock: You must complete Act III.

Unlockable Characters
The PSP version has these exclusive characters:

Dark Phoenix ... Clear the story mode.
Cable ... Clear all the Bonus Comic Book missions.
X-Man ... Clear all the Bonus Comic Book missions.
Cannonball ... Clear all the Bonus Comic Book missions.

Cheat: Unlock All Characters
Go to the team management screen and enter RIGHT, LEFT, LEFT, RIGHT, UP, UP, UP,
START.