Where did Kevin Come from?

It may be hard to imagine, but Kevin wasn't always a handsome, powerful, demigod of the earth. In what would become modern day Africa, Kevin was born as a gorilla and lived a normal gorilla life. Around this time, the all powerful entity rock man was looking for a vessel to carry out his will on planet earth. Rock Man saw Kevin's bravery and kindness after he saved his brother from a saber-tooth tiger attack. After this event, Kevin was bestowed legendary power and near immortality from Rock Man.