Sonic is the main character and the game features him trying to defeat a god called Time Eater that is controlled by Eggman.
Classic Metal Sonic is the rival boss of this area in the 3DS version, he races Sonic to the end of the Casino Street, attacking him as they go.
As Sonic returns to the Chemical Plant, he goes through the Stardust Speedway area and is forced into battle with Classic Metal Sonic who uses more powerful versions of his old attacks, Metal Sonic is eventually defeated and when the finishing kick is placed by Sonic, he explodes.
Onboard the Death Egg, Sonic encounters an upgraded version of the Giant Mech (here referred to as the Death Egg Robot) after a long battle that takes place on a lift and later in the main hanger, the Death Egg Robot is destroyed.
Dreamcast and Modern
The E-1001 Egg Pawn continue to plague the Seaside Hill just as before.
The Egg Pawn Knights that were buolt by Eggman and NEGA will attack Sonic here.
Eggman's Egg Fighter series are attacking the city and they will attempt to destroy Sonic.
The worker Egg Pawns reappear in this level.
Sonic confronts Neo Metal Sonic in his Egg Emperor once again on the deck of the Final Fortress, he fights the upgraded veichle and eventually defeates it, Neo Metal Sonic is not seen afterwards as Eggman angrily speeks to Sonic.
- Though most people belive that Eggman is the pilot of the Egg Emperor, it is really Neo Metal Sonic in his Eggman disguise and the real Eggman appears after the battle.
- This is the first game where Metal Sonic is the First and Semi-Final boss.