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Concept artwork:
Complete the indicated Episode to unlock the corresponding concept art.

Avatar Twin: Episode 3 as Scully
Constantine Creature: Episode 3 as Scully
Constantine: Episode 3 as Scully
Crazed Postal Zombie: Episode 1 as Mulder
Disciple A - Harvester: Episode 2 as Mulder
Disciple A - Harvester (additional): Episode 2 as Scully
Disciple C - Pyro: Episode 3 as Mulder
Disciple C - Pyro (additional): Episode 2 as Scully
Disciple D - Pitcher: Episode 3 as Mulder
Disciple E - Avatar Twin: Episode 3 as Scully
Disciple F - Avatar Twin (additional): Episode 3 as Scully
Hector Zombie: Episode 1 as Mulder
Hector Zombie (additional): Episode 1 as Scully
Mutant Slug: Episode 3 as Mulder
Mutant Wolf: Episode 2 as Mulder
Mutant Wolf (additional): Episode 1 as Scully

Behind the scenes videos:
Complete the indicated Episode to unlock the corresponding video.

Byers: Episode 1 as Scully
Cigarette-Smoking Man: Episode 1 as Mulder
Krycek: Episode 2 as Mulder
Langly: Episode 2 as Scully

Storyboards:
Complete the indicated Act to unlock the corresponding storyboard.

101 through 115: Episode 3, Act 2 as Scully
20 through 27: Episode 1, Act 1 as Scully or Mulder
28 through 32; 37 and 38: Episode 1, Act 2 as Scully
33 through 36: Episode 1, Act 2 as Mulder
39 through 41: Episode 2, Act 1 as Mulder
42 through 55: Episode 2, Act 2 as Mulder
56 through 59: Episode 2, Act 1 as Scully
60 through 73: Episode 2, Act 2 as Scully
74 through 84: Episode 3, Act 1 as Mulder
85 and 86: Episode 3, Act 1 as Scully
87 through 100: Episode 3, Act 2 as Mulder

Alternate costumes:

Successfully complete the game to unlock the classic costumes (Bobby Drake/original Iceman, 1990's Colossus/without metal, original Beast, 1980's Cyclops, original Jean Grey/Phoenix, original Nightcrawler, street clothes Magma, 1990's Wolverine/Weapon X).

Play as Storm:

Successfully complete level 1.

Play as Emma Frost:

Locate Emma Frost in X Mansion after the Nuclear Facility level.

Play as Beast:

Successfully complete level 1.

Play as Cyclops:

Defeat Mystique in the New York City Riot level.

Play as Gambit:

Successfully complete level 3.

Play as Ice Man:

Successfully complete level 1.

Play as Jean Grey:

Successfully complete level 1.

Play as Jubilee:

Successfully complete level 2.

Play as Magma:

Successfully complete Magma's second training round.

Play as Nightcrawler:
Successfully complete level 2.

Play as Professor X:
Enter the Astral Plane for the first time.

Play as Psylocke:
Successfully complete the New York City Riot level.

Play as Rogue:
Successfully complete level 1.

Artwork:
Collect all 19 Sketchbooks to unlock the artwork in Colossus' room.

Stat increase:
Collect the hidden Comic Books to increase your characters' stats.

Bonus Danger Room tasks:
Collect the hidden Danger Room Discs to unlock more tasks in the Danger Room.

Hint: Icy Swords:
Have Iceman and Magma stand next to each other. Then, have Iceman do his R1 + Circle move while standing next to her. Magma will have icy swords at the end of her hands.

Hint: Making bridges:
This can be done with Jean Gray, Magma, or Ice Man. For Jean Gray, hold R1 + X. For Magma, hold R1 + Circle. For Iceman, hold R1 + X.

All characters:
Press Right, Left(2), Right, Up(3), Start at the character selection screen at an Xtraction point where you usually save the game or switch characters.

All skins:
Press Down, Up, Left, Right, Up(2), Start at the team management screen.

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