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Kadic Bombshell is the twentieth episode of Season 4 and the eighty-fifth episode of Code Lyoko.


After studying Romeo and Juliet in English class, Odd, Aelita, Ulrich, and Jeremie discuss the concept of dying for someone you love. Once Yumi arrives, the group notices a large crowd of students gathering in the courtyard, and find out from Milly and Tamiya that Brynja Heringsdötir, Sissi's exceptionally beautiful pen pal from Iceland, has come to visit Kadic and has attracted the attention of almost every male and female students in the school.

With a few exceptions, Brynja continues to captivate the student body for the rest of the day. After dinner, Odd accidentally bumps into Brynja on the way out of the cafeteria, and when she flirts with him, he becomes even more enchanted than before. In the rec room, Odd, Ulrich, and Jeremie begin to argue over Brynja, and Yumi and Aelita, two of the few students uninterested in the new girl, chide them all for being jealous before Brynja herself arrives to speak with Odd. After Odd leaves with her, Ulrich and Jeremie come to their senses, realizing the rift Brynja is causing in their friend group.

When Odd enters his dorm to prepare for a date with Brynja, he finds Ulrich, Yumi, Jeremie, and Aelita already there. Together, the four of them explain Brynja's disruption of their own group and how crucial their friendship is to fighting X.A.N.A.. However, when the four tell Odd to stop seeing Brynja, Odd accuses them all of jealousy and storms out of the room. Later that evening, Jeremie and Aelita travel to the Factory and launch a program as they discuss the situation regarding Odd and Brynja. The two then leave the Factory to let the program run through the night.

Meanwhile, on their date, Brynja manipulates Odd into telling her about his and his friend's secrets and he decides to show her the Factory to tell her their biggest secret. Having just missed Jeremie and Aelita, Odd and Brynja enter the lab and find it empty. Impressed, Brynja touches the interface despite Odd's protests and unwittingly alters Jeremie and Aelita's program. Much later, in the dawn, Jeremie is alerted to an activated tower via the desktop in his dorm room and calls Ulrich, but the alert quickly stops itself, leaving him and Ulrich confused.

Later on, Jeremie and Aelita return to the Factory to investigate the false alarm. When Jeremie starts typing on the keyboard, the Superscan detects the activated tower in the Desert Sector, but Jeremie points out that this is yet another false alarm and realizes that the program he installed has been modified. Knowing that someone came to the Factory last night, Jeremie checks the surveillance camera only to reveal that Odd brought Brynja to the Supercomputer. They quickly discover that Brynja entered "parasitic foreign data" into the program, causing widespread damage to the Supercomputer. Suddenly, the Superscan detects another activated tower in the Forest Sector. Unable to trust the Superscan because of Brynja's meddling, Aelita tells him to send her to Lyoko. Jeremie reluctantly agrees to send her there to manually search for an activated tower while he notifies Ulrich and Yumi. However, the bug-ridden Supercomputer sends Aelita to the Ice Sector instead of the Forest.

On campus, Ulrich and Yumi are informed by Jeremie about the situation, and after asking Sissi where they can find Odd and Brynja, they confront both of them in the park. After a short argument, Yumi and Ulrich disown Odd from the friend group before heading to the Factory. Meanwhile, Aelita uses her Second Sight and detects no activated tower. However, when Jeremie attempts to manually devirtualize her, he finds this function is bugged as well, and Aelita ends up in the Mountain Sector, where she is confronted by several Bloks and Kankrelats.

As Jeremie works to repair the damage to the Supercomputer, Aelita battles the monsters. However, she is soon ambushed by William and is forced to flee. When Yumi and Ulrich arrive at the Factory, Jeremie attempts to send them to the Mountain Sector to help Aelita, but the bugged program virtualizes them to the Desert Sector instead, where they find a way tower in order to get to Aelita. Aelita is eventually cornered by William and the monsters, and is captured by William's Super Smoke. However, Yumi and Ulrich arrive in time to save her, and a battle commences. Meanwhile, at the local swimming pool, Odd is wracked with guilt over his recent behavior, and seeing that Brynja has lost interest in him, he decides to abandon her and return to the Factory.

When Odd arrives, he apologizes to Jeremie, who is still angry at him but agrees to send Odd to Lyoko to help the others. Meanwhile, in the Mountain Sector, Ulrich and Yumi are each devirtualized by William and a Kankrelat respectively, as Jeremie succeeds in fixing the Supercomputer. As William closes in on Aelita, Odd arrives in the Mountain Sector and defeats William. However, in a last-ditch effort, William shoves Aelita off a cliff as he is devirtualized and Odd jumps off after her. With a well-aimed Laser Arrow, Odd triggers Aelita's star bracelet, causing her Angel Wings to open and saving her from the Digital Sea. Aelita then catches Odd and carries them both back to safety.

In the scanner room, Odd apologizes to the others, who accept his apology and decide to keep him in the group. Jeremie decides against performing a return to the past, convinced Brynja is not nearly as interested in revealing their secret as she is in manipulating people. The next day, Brynja leaves early to see the French countryside at Sissi's cousin's house, and the Lyoko Warriors celebrate her departure. Sissi, who felt overshadowed by Brynja during her stay, is revealed to be relieved as well.


  • The original French name for this episode is La belle de Kadic, which translates to The Beauty of Kadic in English.
  • When Odd enters his dorm room and finds that his friends have gathered inside, he breaks the fourth wall for the second time by confusedly asking "Did I miss an episode?" The first time was in Exploration.
  • This is the only episode in which Brynja Heringsdötir makes an appearance.
  • This episode marks the final appearance of the pool.
  • In this episode, William is noticeably more talkative than usual. The reason for this is unknown.
  • When William has Aelita cornered, he tells her "X.A.N.A.'s finally going to have your company for good!" This implies that X.A.N.A. wants to keep Aelita the same way he did with William once he has destroyed Franz Hopper.


  • This episode's title card features a red tower despite the fact that X.A.N.A. didn't attack Earth. Although this could be a reflection of the bugged Superscan's repeated false alarms.
  • When Milly tells Yumi that Sissi was getting attention because of Brynja visiting Odd and Ulrich can be seen in the front up close to Brynja but in the next shot they are back standing next to Yumi.