After a trip to the Carthage Region, Jeremie believes he has the data necessary to cure Aelita's virus. While the two work on the cure, Odd, Ulrich, and Yumi go to a rock climbing contest. Odd races against Hervé, who is no match for Odd. William then goads Ulrich into racing, despite his obvious reluctance. During the race, Ulrich gets dizzy and falls. Yumi realizes that he must have vertigo. Ulrich, embarrassed, runs off. Meanwhile, Jeremie finds the anti-virus and gives it to Aelita. Despite some problem with the application, it seems to work. However, this does not last. An error in the anti-virus causes her to turn invisible. On top of that, she can't enter the towers on Lyoko, making it impossible for her to stop Xana's latest attack, which is a possessed pack of wolves targeting Odd, Ulrich, and Yumi.

L'Ulrich no ho ha volgut reconèixer mai davant dels seus amics que li fan por les altures. Avui en William ho aprofitarà per humiliar-lo. I el XANA aprofitarà per enviar tota una colla de llops al bosc on s'ha anat a amagar l'Ulrich. La Yumi i l'Odd el busquen i també corren un greu perill...

在迦太基地区探索后，Jeremie 相信自己掌握了治愈 Aelita 病毒的必要数据。在两人研究的同时，Odd、Ulrich 和 Yumi 去参加攀岩比赛。Odd 与 Hervé 比赛，后者不是 Odd 的对手。尽管 Ulrich 很不情愿，William还是劝他参加比赛。比赛中，Ulrich 头晕目眩，摔倒在地。Yumi 发现他一定是得了眩晕症。Ulrich 尴尬地跑开了。与此同时，Jeremie 开发好了反病毒程序并把它交给了 Aelita。尽管在使用过程中出现了一些问题，但它似乎起了作用。然而，好景不长。反病毒程序中的一个错误导致她变成了隐形人。除此之外，她还无法进入圆塔，使她无法阻止 Xana 的攻击...

在迦太基地区探索后，Jeremie 相信自己掌握了治愈 Aelita 病毒的必要数据。在两人研究的同时，Odd、Ulrich 和 Yumi 去参加攀岩比赛。Odd 与 Hervé 比赛，后者不是 Odd 的对手。尽管 Ulrich 很不情愿，William还是劝他参加比赛。比赛中，Ulrich 头晕目眩，摔倒在地。Yumi 发现他一定是得了眩晕症。Ulrich 尴尬地跑开了。与此同时，Jeremie 开发好了反病毒程序并把它交给了 Aelita。尽管在使用过程中出现了一些问题，但它似乎起了作用。然而，好景不长。反病毒程序中的一个错误导致她变成了隐形人。除此之外，她还无法进入圆塔，使她无法阻止 Xana 的攻击...

Humilié pendant un cours d'EPS, William part ruminer dans les bois... au moment précis où XANA décide d'attaquer.

Jeremy mette a punto un antivirus da somministrare ad Aelita per recidere il suo legame con XANA, ma poco dopo averglielo iniettato la ragazza diventa invisibile, perciò il programma deve essere eliminato. Nel mentre, Ulrich si trova costretto a fare i conti con la sua paura per le altezze durante l'ennesimo attacco nemico.

A sentir-se humilhado após a aula de educação física, William vai espairecer no bosque — é então que o XANA decide atacar.

Humillado durante una clase de educación física, William se va a cavilar al bosque... en el preciso momento en que XANA decide atacar.