Tom and Sonic were fishing one evening and all of the sudden a mysterious black cloud out of nowhere looms over Sonic and strikes him. The cloud Sonic got struck by was somehow toxic, and becomes infected by a virus called ".EXE" and is now EVIL! Tom seeks help from Sonic's friends Tails, Knuckles, Amy, and shockingly arch rival Shadow who would agree to help. For the first time ever, Tails, Knuckles, Amy, and Shadow must work together without Sonic for an adventure unlike any other and battle the origins of the virus ".EXE" and the new monster who was once Sonic now called "Sonic.EXE". Can the four save Sonic or will ".EXE" take over them as well?
