Complete the following tasks to unlock the corresponding playable characters.

Black Panther:
Collect the 5 Black Panther Action Figures. There is one in each act.

Blade:
Play Crane Game in Murder World

Daredevil:
Collect the 5 Daredevil Action Figures. There is one in each act.

Dr. Strange:
Rescue him from Mandrin in Act 1.

Ghostrider:
Rescue him from Mephisto in Act 2.

Nick Fury:
Complete the game on Easy or Normal mode.

Silver Surfer:
Complete ALL the Comic Book missions.