Batman Flash
Platform: Nintendo Entertainment System
Region: Pirate
Media: Cartridge
Controller: NES Gamepad
Genre: Platformer 
Gametype: Pirate
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This is a hack of Monster in my Pocket for the NES, where the 2 main guys were replaced by Batman and Flash. Nothing else except these 2 sprites and the main menu was changed. The title on the actual cart was "Batman & Flashman". 

http://www.youtube.com/watch?v=TgDGBTGkvPM