Shadolloo is down but not out. It lives through its weapon divison called S.I.N. lead by the robot Seth, they intend to continue Shadolloo's evil agenda. They start another world warrier tortument to measure the power of the world's toughest fighters and hopefully gain the power for itself. Our heroes are not the only ones rooting for their defeat. Kolin and Urien have escaped from custody and intend to make the Illuminati as powerful as it was under Urien. But first they need to take care of the competition in S.I.N. To do so they get and old freind of one of our heroes to infiltrate S.I.N's tortument and take down Seth. Meanwhile, after the events of Street fighter 3, Cammy and Juri have teamed up to finally free the dolls once controlled by M.Bison. Also Ryu finds out a secret that his master, Gouken has been hiding that will change his life forever.
