After being rejected by Yumi, William makes it his mission to find out the secret she's hiding. Soon enough, he manages to follow Ulrich and Odd to the factory and learns about Lyoko and Xana. Meanwhile in The Ice Sector, the Scyphozoa possesses Aelita to enter Code:Xana in the way tower, but is devirtualized just in time. The group thinks William's help is going to be quite useful, when a possessed demolition worker sets several bombs in the factory. They take a vote as to whether or not to include William as part of their group, but Yumi votes no and Jeremie initiates a return to the past.

被 Yumi 拒绝后，William 将找出她隐藏的秘密作为自己的使命。不久，他设法跟踪 Ulrich 和 Odd 到了工厂，并了解到 Lyoko 和 Xana 的情况。与此同时，在冰原区，钵水母纲附身在Aelita身上，进入了Code:Xana的圆塔...

Après avoir croisé Yumi en pleine nuit dans la rue, William est déterminé à découvrir ce qu'elle manigance !

Ao ver Yumi na rua, a meio da noite, William decide descobrir o que ela anda a tramar!

Después de encontrarse con Yumi en medio de la noche en la calle, William está decidido a descubrir qué está haciendo ella.