Bruce Buffer
Win UFC mode with all characters.

John McCarthy
Win UFC mode as Bruce Buffer.

Mario Yamasaki
Win UFC mode as John McCarthy

The Cat
Win four consecutive matches in arcade mode.

Femme Fatale
Win eight consecutive matches in arcade mode.

Ice-T
Win sixteen consecutive matches in arcade mode.

Mask
Win twenty seven consecutive victories in arcade mode.

Fourth Of July Mode
Set the system date to July 4 to unlock Homer in his car. Press L and he will shoot fireworks out the window.