Dr. Eggman

Dr. Ivo Robotnik, also known as Doctor Eggman, is the main antagonist of the Sonic series.

He appears in Sonic X and Sonic Boom.

The V Team Island Adventure
TGTTA 2

Dr.Eggman from the past with Dr.Cortex assist Slade and his ensemble in their endevaors. He and Cortex help fight Joker and his team and find out about Joker taking THe Teen Titans and tell Harry, Mojo, Technus, Manray and the Flying Dutchman.

Ultimate Story
Dr. Robotnik made his first appearance in the Lisa Simpson Chronicles. He was the villain that Lisa and her friends had to combat constantly along side their friends, Sonic and Tails, during their stay on Mobius.