After going through a portal in Mobius to catch Dr. Eggman, Sonic gets transported to Jump City, where the Teen Titans live on Earth. After getting help from Robin, Starfire, Cyborg, Beast Boy, and Raven, they come across the rest of Sonic's friends and a terrible surprise. The long lost Slade has teamed up with enemies of Sonic, making a team that could be invincible. Will Sonic and the Teen Titans be able to stop Slade and his allies from taking over the world?

Sonic is somehow pulled into the world of Mega Man, and he doesn't know which side to pick until he and Mega Man are captured by the infamous 'Dr. Wily', forced to join sides with the robot kid. They join together to try and stop a nefarious plot of the evil doctor, but will Sonic be able to help his friend, or will this be their final battle?