Some characters can be unlocked naturally by progressing through the storyline, while others require a character token to unlock them for purchase at the store. Successfully complete the indicated task to unlock the corresponding character.

Character	How to unlock
Alfred	Get the "Activate The Elevator" objective at the start of Hub Visit 1.
Batman	Start Level 12.
Brainiac	Successfully complete Story mode.
Cheetah	Start Level 8.
Cyborg	Start Level 3, and get the rocket ready.
Green Lantern	Get the "Restore The Com Link" objective in Hub Visit 2.
Indigo-1	Progress through the storyline.
Killer Croc	Progress through the storyline.
Lex Luthor	Defeat Mr. Freeze at the start of Hub Visit 5.
Martian Manhunter	Get the "Restore The Com Link" objective in Hub Visit 2.
Plastic Man	Defeat Mr. Freeze at the start of Hub Visit 5.
Robin (Lex Luthor disguise)	Start Level 12.
Saint Walker	Progress through the storyline.
Solomon Grundy	Defeat Mr. Freeze at the start of Hub Visit 5.
Star Sapphire	Progress through the storyline.
Superman	Start Level 7.
The Flash	Start Level 3, and get the rocket ready.
The Joker	Progress through the storyline.
Wonder Woman	Start Level 6.
Wonder Woman (Cheetah disguise)	Start Level 12.