Doctor Ivo Robotnik Sr. is the main antagonist of Adventures of Sonic the Hedgehog. He is a comically obese scientist. He looks like an early version of Dr. Eggman, but with a much larger, much more ragged orange mustache, a conical head, a drooping pink nose, black eyes with red irises and black pupils, a round body and wiry legs. He wears a red, black and yellow bodysuit, grey tights and a pair of grey gloves with metal gauntlets. Very rarely, Robotnik also wears a yellow cape to go along with his regular attire.