What happens when 2 of the greatest of the Sega Universe create an alliance with each other? This story will show what type of events will occur as Robotnik and Death Adder work together to create their army and attempt to conquer the world. Sonic and the other SEGA fighters will interact with each other as they are caught in between their schemes.
In the story mode, you roam around a large city. This city will serve as a hub world where you can access story events, interact with other characters that may even off side missions, and you might even encounter some random enemies, such as Eggman robots, that you must defeat.