Enter these codes at the character select screen.

To play as Mayhem press LEFT, RIGHT, DOWN, LEFT, UP, LEFT, DOWN, LEFT, DOWN

To play as Assault press RIGHT ARROW, UP, UP, RIGHT, DOWN, RIGHT, UP, UP

To play as Anil 8 press UP ARROW, RIGHT, DOWN, RIGHT, RIGHT, UP, LEFT, UP

To play the Supervisor press DOWN, RIGHT, DOWN, UP, RIGHT, DOWN, LEFT, DOWN, UP, RIGHT, UP

To play Vitriol, press RIGHT, RIGHT, RIGHT, UP, UP, DOWN, LEFT, LEFT, DOWN, DOWN