On the 6th or 7th level you will face Sabertooth and Avalanche at the same time, who are both physical resistants. A short while after beating Sabertooth he will respawn, with about half as much health, even if he falls in the lava. The EASIEST WAY to beat this level, is to have a stronger Iceman character, with a leveled up Deep Freeze move (the first move on the list, R2+X). If you have any of the Special X-treme moves (R2+triangle) this will be very usefull. ANYWAY- Select Ice man as your character and perform the (R2+triangle) move a couple of times, then continuosly use is Deep Freeze move (R2+X), this will slow the boss down tremendously. Make sure you have LOTS of energy packs, and keep doing this move, if you can, take avalanche out first.let the AI characters do most of the fighting.
Bobby Drake, Original Iceman
Beat the game.
Colossus
Beat Nuclear Facility level.
Colussus without metal, Colussus 90's
Beat the game.
Cyclops
Beat Mystique.
Emma Frost
Beat Nuclar Facility level (meet in X-mansion).
Gambit
Finish Third Level.
How to beat the Morlocks
To beat the Morlocks,you should use a team of all women e.g Jean Grey,Rogue,Storm,Jubilee.The most poweful women who can beat the Morlock brute are Jean Grey and Rogue. Use a combination of kicks and punches.
Ice Man, Jean Grey, Beast, Rogue, and Storm
Finish First Level.
Jubilee and Nightcrawler
Finish Second Level.
Magma (on field missions)
Beat Blob in Magma/Cyclops mission.
Original Beast
Beat the game.
Original Cyclops, Cyclops 80's
Beat the game.
Original Jean Grey, Phoenix
Beat the game.
Original Nightcrawler
Beat the game.
Psylocke
Beat NYC Riot, Morlock Rescue, and Muir Isle fight levels.
Storm's white outfit
Beat the game.
Street Clothes Magma
Beat the game.
Wolverine 90's, Weapon X
Beat the game.
Xtreme Costumes
On the Main Menu enter UP, UP, RIGHT, LEFT, DOWN, DOWN, START.