Franz Hopper, creator of the new Lyoko, mysteriously disappears. In their search to find him and bring him back the Code Lyoko heroes are infected with a virus and after they have returned to the real world they realise that virtual copies of them have remained in Lyoko! They delve deep into the Digital Sea in search of the mysterious creature that infected them, to defeat their virtual copies while stopping the continuous attacks of X.A.N.A. Join the warriors and interact with your favourite characters Odd, Yumi, Ullrich, Aelita and Jeremy.