Lord Eggman (Boom)

Past
An undefeated overlord, Eggman conquered Seaside Island at some point in the past. Establishing himself as the "lord of everything you see", his only opposition came from a small resistance group known as the Rebellion, led by Sticks the Badger. He also acquired the bright-eyed Tails as his lab assistant.

One time, Dave forgot to give Eggman extra pickles at Gourmet Burger. As punishment, Eggman had him thrown in jail.

Season two
During a trip through Hedgehog Village, Eggman met Sonic the Hedgehog and demanded he kneeled before him. When Sonic refused, he had him arrested. Eggman later met Sonic again, who had brought Team Sonic with him, at his lair when Tails brought this intrusion to his attention. During the ensuing battle between Team Sonic and Eggman's robots, Eggman left Tails to get hit by his missile when he attempted to attack Team Sonic. However, his missile missed and Sonic ended up saving Tails. Tails subsequently defected to Team Sonic, who defeated Lord Eggman for the first time in his life.

Following his defeat, Lord Eggman sought to get revenge on Sonic. While scheming however, he was visited by his Sonic Boom World counterpart, who provided him with a portal to Sonic's location in the Sonic Boom World. Accepting the offer, Lord Eggman confronted Sonic, only to get attacked by Shadow the Hedgehog, who sought Dr. Eggman's demise. Lord Eggman promptly cleared up the misunderstanding and provided Shadow with a portal that led to the dimension Dr. Eggman was in. He was subsequently put into Team Sonic's custody when Sonic decided to follow Shadow. When Sonic and Shadow returned with Dr. Eggman and Metal Sonic in tow, Lord Eggman and his counterpart ended up getting kidnapped by Shadow in the confusion. What Shadow planned was to keep the Eggmans together so their shared presence could create an abnormality that would destroy the universe. Fortunately, Sonic would save the universe when he found the Eggmans and got Lord Eggman back home.

Appearance
Lord Eggman is essentially a doppelganger of his Sonic Boom World counterpart. Physically, the two of them are identical, except that Lord Eggman's skin is paler and that he has a scar on the left side of his face. He also wears the same attire as his counterpart, except Lord Eggman's jacket is black instead of red. His coat lining is also bronze with red buttons and brown cuffs, and his pants are black instead of grey.