According to NES Guide, “Mike Tyson’s Intergalactic Power Punch was set to be a true sequel to the original Mike Tyson’s Punch-Out.” Continue reading to see the prototype in-action.

However, due to a falling out between Nintendo and Tyson, the project took a left hook and the game was altered to the release known as Power Punch II with the main character’s name being changed to “Mark Tyler”.

[via KotakuNES Guide]