Team Bonuses
Agents Of Shield (+5% to all resistances)
Captain America
Nick Fury
Spider-Woman
Wolverine

Agile Warriors (+10% reduced energy cost)
Spider-Man
Spider-Woman
Elektra
Deadpool

Air Force (+15% maximum health)
Human Torch
Ms. Marvel
Storm
Thor

Alternate Identities (+5% criticals)
Ironman - War Machine
Ghost Rider - Western
Spider-Woman - Secret Wars
Ms. Marvel - Ventura
Thor - Beta Ray Bill

Assassins (+60% for S.H.I.E.L.D.. credit drops)
Blade
Deadpool
Elektra
Wolverine

Avengers (+5% damage)
Captain America
Thor
Iron Man
Spider-Woman
Ms. Marvel

Bad To The Bone (+5% damage inflicted goes to health)
Blade
Ghost Rider
Luke Cage
Wolverine

Bruisers (+15% striking)
Thing
Captain America
Luke Cage
Ms. Marvel

Classic Avengers (+15% maximum energy)
Black Panther
Captain America
Iron Man
Thor

Dark Past (+5% XP)
Blade
Elektra
Ghost Rider
Spider-Woman

Defenders (+5% damage inflicted goes to health)
Dr. Strange
Iceman
Luke Cage
Silver Surfer

Double Date (+5% health regeneration)
Black Panther
Invisible Woman
Mr. Fantastic
Storm

Fantastic Four (+20% health per KO)
Mr. Fantastic
Invisible Woman
Human Torch
Thing

Femme Fatale (+5% damage)
Ms. Marvel
Storm
Invisible Woman
Elektra
Spider-Woman

Flashback (+15% max health)
Iceman in Snowy Form
Captain America in WW2
Daredevil in Original
Ghost Rider in Original
Iron Man in Classic
Ms. Marvel in Original
Wolverine in Classic

Martial Artists (+15% striking)
Black Panther
Captain America
Daredevil
Moon Knight
Nick Fury

Marvel Knights (+6% to all stats)
Black Panther
Daredevil
Dr. Strange
Luke Cage
Spider-Man
Moon Knight

Marvel Royalty (+60% credit drop)
Black Panther
Dr. Strange
Thor
Storm

Natural Forces (+5% damage inflicted as health gain)
Thor
Storm
Human Torch
Ice Man

Natural Leaders (+5% XP)
Captain America
Dr. Strange
Mr. Fantastic
Nick Fury
Storm

New Avengers (+5% to all resistances)
Captain America
Luke Cage
Wolverine
Spider-Man
Spider-Woman

New Fantastic Four (+15% maximum energy)
Ghost Rider
Luke Cage
Spider-Man
Wolverine

Power Platoon (+20% energy per KO)
Silver Surfer
Iron Man
Ms. Marvel
Thor

Raven Ultimates (+6% to all stats)
Deadpool
Colossus
Moon Knight
Thing

Scorchers (+10% reduced power cost)
Ghost Rider
Human Torch
Storm
Thor

Supernaturals (+5% health regeneration)
Blade
Dr. Strange
Ghost Rider
Thor

Think Tanks (+15% max health)
Dr. Strange
Mr. Fantastic
Spider-Man
Iron Man

Weapons Specialists
Blade
Captain America
Deadpool
Elektra
Nick Fury

X-Men (+15% maximum energy)
Colossus
Iceman
Storm
Wolverine

Unlockables
[Submitted by: Cheat Masters ]
Hard Mode: Beat the game on Normal
Nick Fury: Beat the game on Easy or Normal
Daredevil: Collect the five Daredevil action figures. You should have Daredevil half way through act three.

1. free the guy trapped in a clam (Atlantis). He gives you a code to unlock a close by chest near a fallen submarine
2. Dr. Strange's library
3. Beginning of the circus level in Dooms Castle, break down the door to a storage room
4. Near the Odin statue's left hand in the Bifrost level is a button that will reveal a chest with the action figure
5. Take the right path in the Asgard level. It's on a small path before you get to the houses.

Black Panther: Collect the five Black Panther action figures
Dr. Strange: Save Dr. Strange in Mandarin's Palace
Ghost Rider: Trade places with Ghost Rider in Hell in order to save his soul
Blade: Beat toy grab minigame in the Carnival in Murderworld.
Second & third costumes for all characters: Must play as that character and gain between 2-4 levels.
Fourth costume for all characters: Beat the Combat Training challenge for the character.
Silver Surfer: Defeat Galactus on the Skrull Throneworld.

Comic Book Covers
How to unlock: During the game, enter LEFT, RIGHT, RIGHT, LEFT, UP, UP, RIGHT, START.