Dr. Metalix and Old Eggman

It's Dr. Metalix and Eggman. I wanna explain why, but I'll put it in a short way.

Metalix is Eggman's step-father. He adopted him because he wanted somebody to keep his empire rising. Even though he still fails because of the Hedgehog for over 10 years. At this time, Eggman became old and retired his evil ways. Metalix is now taking over, he has all of Eggman's robots all to himself.

He still doesn't know who his real father was, or even his mother. But soon he'll find out.