Mule McGee is a horse with a green sandle, a green strap on his mouth, and a green tail. He has a rather plain appearance.
Mule McGee is a captured enemy by Catherine Derigueur, along side Old McGee and Headcase. After you defeat her, both Old McGee and Mule McGee will come out of the cage and try to hurt you. Easily you just hit both of them for two secret bonus points. But if you try to get them at a very late time, they will leave the screen to the left where you can't go anymore and will lose your opportunity to get the secret bonus points.