Unlockables:
All Comics: press RIGHT, LEFT, LEFT, RIGHT, UP, UP, RIGHT, START on the review menu screen
All Movies: press LEFT, RIGHT, RIGHT, LEFT, DOWN, DOWN, LEFT, START
Iron Man: getting four homing beacons per act (up to the act 5)
Professor X: all the Danger Room missions
Deadpool: beat the game
Team Skill Bonuses: Under several conditions (if the team consists of one of the characters combination below, for example), you can receive cool bonuses!
4 heroes in Age of Apocalypse costumes: attack 100% (Age of Apocalypse)
Nightcrawler+Sunfire+Toad+Deadpool: +5 % XP (Agile Warriors)
Juggernaut+Magneto+Scarlet Witch+Toad: +5 % XP (Brotherhood of Evil)
Juggernaut+Colossus+Wolvernine+Rogue: +20 energy per kill (Bruiser Brigade)
Cyclops+Jean Grey+Gambit+Rogue: +20 energy per kill (Double Date)
Storm+Scarlet Witch+Rogue+Jean Grey: +5% of damage (Femme Fatale)
Rogue+Deadpool+Gambit+Wovlerine: +5% of damage (Dark Past)
Gambit+Bishop+Cyclops+Iron Man: +5% damage increase (Energy Corps)
Bishop+Deadpool+Nightcrawler+Gambit: +5% damage increase (Special Ops)
Magneto+Professor X+Scarlet Witch+Juggernaut: health regeneration +5% (Family Affair)
Storm+Iceman+Sunfire+Magneto: +10 to all resistances (Forces of Nature)
Colossus+Juggernaut+Iron Man+Magneto: +10 to all stats (Heavy Metal)
Iron Man+Scarlet Witch+Wolverine+Bishop: +15% of health (New Avengers)
Nightclawler+Storm+Colossus+Sunfire: +15% of health (New X-Men)
Cyclops+Jean Grey+Iceman+Magneto+Toad+Professor X: +15% of energy limits (Old School)
Iceman+Professor X+Iron Man+Deadpool: +60% techbit drops (Raven Knights)