Fight as Bastion:Platform: Gamecube
Successfully complete the game story mode as Magneto without losing any matches to face Bastion. Defeat Bastion to unlock him as a selectable character.
Fight as Bishop:Platform: Gamecube
Successfully complete the game in arcade mode as Gambit to unlock Bishop as a selectable character.
Fight as Blob:Platform: Gamecube
Successfully complete the game in arcade mode as Bishop to unlock Blob as a selectable character.
Get Dark PhoenixPlatform: Gamecube
Complete the Arcade Mode using the Phoenix character.
Get PsylockePlatform: Gamecube
Complete Arcade Mode using the Betsy character.
Get the Blob characterPlatform: Gamecube
Complete the Arcade Mode using the Bishop character.
Fight as Psylocke:Platform: Gamecube
Successfully complete the game in arcade mode as Betsy to unlock Psylocke as a selectable character.
Fight as Dark Phoenix:Platform: Gamecube
Successfully complete the game in arcade mode as Phoenix to unlock Dark Phoenix as a selectable character. Alternately, successfully complete the game in story mode as Magneto.
Fight as Sentinel A:Platform: Gamecube
Successfully complete the game in arcade mode as Cyclops.
Third costume:Platform: Gamecube
Successfully complete the game in story mode to unlock that character's third costume.
Sixth costume:Platform: Gamecube
Defeat all ten fighters in time attack mode in under fifteen minutes to unlock the sixth costume for the fighter you selected.
Seventh costume:Platform: Gamecube
Select team mode and choose to fight with eight characters. Defeat all of the your opponent's team by using two or less of your own fighters to unlock the seventh costume for the character(s) you used.
Wolverine gets his original yellow/blue/black costume.
Phoenix gets a red/gold costume similar to Dark Phoenix.
Juggernaut, Gambit, and Psylocke get a costume similar to their comic book original.
Beast gets a blue costume with a yellow X on his chest, and he also has a helmet.
Ending sequences:Platform: Gamecube
There are three possible endings in the game in story mode.
- Regular ending (Magneto's Victory): Defeat Bastion as Magneto.
- Alternate ending (Phoenix's Victory): Lose the Magneto vs. Bastion fight and you will go to the Phoenix vs. Bastion fight. Defeat Bastion as Phoenix.
- Secret Ending (Fury of Dark Phoenix): Get a "Perfect" victory in the Phoenix vs. Bastion fight. This will also, unlock Dark Phoenix as a playable character.
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