When Dr. Eggman learns that Knuckles has just discovered the oldest map in the world, which holds the location of the lost continent of Murasia, he sends Decoe and Bocoe on a mission to take the map away from Knuckles.
Sonic and his friends are in pursuit of Dr. Eggman who has fled into the volcano which lies at the world's bellybutton. They come upon the Murasians ruin which attributed its destruction to a supposed dragon god.
Dr. Bickley discovers that Sonic's world and theirs were once one and the same. As the two world slowly completes its reunification, she realizes that the process would ultimately cause time to stop. The only solution? Send Sonic and the rest back home.
As Chris spends his last day with Sonic while they prepare for their trip home, President's army colonel decides to act on his own to capture Dr. Eggman.
Chris is unable to come to terms with the idea of parting with Sonic and decides to run away with Sonic. As the time runs short for Chaos Control to send Sonic back to his world before the two worlds merge, Chris and Sonic say their good byes one last time.
With everyone back in their home worlds the crisis has been averted and all seems to be back to normal. Except, no one seems to know where Sonic is. His friends and even Eggman begins to wonder where the blue hedgehog might be.
