Enter one of the following codes at the character selection screen to play as the corresponding Boss.

Code - Boss:
[Up] [Righ [Down] [Righ [Righ [Up] [Lef [Up] - Anil 8
[Righ [Up] [Up] [Righ [Down] [Righ [Up] [Up] - Assault
[Lef [Righ [Down] [Lef [Up] [Lef [Down] [Lef [Down] - Mayhem
[Down] [Righ [Down] [Up] [Righ [Down] [Lef [Down] [Up] [Righ [Up] - Supervisor
[Righ, [Righ, [Righ, [Up], [Up], [Down], [Lef, [Lef, [Down], [Down] - Vitriol