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Temporary Insanity is the eighth episode of Season 3 and the sixtieth episode of Code Lyoko.


The episode opens in Sector Five, with Aelita collecting data about Franz Hopper whereabouts at the interface while Odd, Yumi, and Ulrich fend off several Mantas. Yumi is devirtualized during the fight leaving three of them on Lyoko. As Odd and Ulrich ride on the Overboard together, two Mantas work together to fire a strange red beam at them, which causes them to emit a red light and lead to a delayed devirtualization. After the mission is over, Jeremie is curious about the beam and plans to research what happened. However, when Odd reminds him they are running late to rehearsals for a school play, the Lyoko Warriors decide to return to campus without investigating as it wouldn't be a wise idea to skip the play and upset Gustave Chardin.

In the gym (which has been converted into a makeshift theater), Ulrich, Odd, Jeremie, and Yumi hold an open rehearsal, performing a scene from Act III of Cyrano de Bergerac. However, in the middle of the scene, Odd and Ulrich both begin to hallucinate that they are on Lyoko. When they start attacking audience members, believing them to be X.A.N.A.'s monsters, they are restrained and rehearsals are canceled. Believing the boys to be mentally ill, an ambulance is called, and Ulrich and Odd are taken to a hospital for the observation. Yumi and Aelita decide to go to the hospital to monitor the boys' conditions while Jeremie returns to his dorm room to follow through with investigating the strange beam and Odd's and Ulrich's strange behavior.

At the hospital, Jeremie calls Yumi and confirms that the beam did, in fact, cause Ulrich and Odd's hallucinations, and tells her that she and Aelita need to bring them back to the Factory so that Jeremie can correct the problem. At the reception desk, Yumi and Aelita ask if they can visit Odd and Ulrich but a nurse tells them that it's strictly forbidden to enter their room. The girls decide to listen to the hospital staff discussing Odd and Ulrich so they can learn which room they're in. Yumi distracts a paramedic guarding the door while Aelita enters Odd and Ulrich's room. Aelita plays into their hallucination to get them to follow her, and together they manage to outrun the hospital staff and later two police officers and escape into town. Meanwhile, Jeremie, who is now at the Factory, discovers monsters attacking the Core of Lyoko and this is why X.A.N.A. used those two Mantas to attack Ulrich and Odd with the hallucinogenic beam.

When Yumi, Aelita, Ulrich, and Odd arrive at the Factory, they are all sent to the Ice Sector where the boys' hallucination continues, as they now believe they're on Earth and at school. Yumi tells Aelita that she will go to the Sector Five to defend the Core, so she can escort the boys to a way tower so that Jeremie can run a program on them.

En route to the tower inside the ice canyon, Aelita, Ulrich, and Odd are confronted by a Tarantula and two Kankrelats, all of which are believed to be Sissi, Nicholas, and Herb by Odd and Ulrich, so they don't proceed to attack them, much to Aelita's annoyance. Meanwhile, Yumi reaches the Core Zone and touches the Key Mechanism. She arrives at the Celestial Dome, and then enters the chamber containing the Core. In the Ice Sector, Aelita defeats the monsters by herself and manages to get Ulrich and Odd into the way tower, where Jeremie successfully runs the program and the boys are returned to normal.

Aelita, Ulrich, and Odd are then sent to Sector Five as Yumi battles trio of Mantas to protect the Core. The trio arrives in the Core's chamber just as Yumi is devirtualized and the Core loses its last protective layer. Just as the last Manta is about to destroy the core, Aelita jumps in front of the laser fire and destroys the Manta with an energy field right as she is devirtualized, saving the Core from destruction. Jeremie then manually devirtualizes Odd and Ulrich and performs a return to the past.

Back at the rehearsal, Mr. Chardin, the drama teacher, stops the performance halfway through and asks for "more insanity." The Lyoko Warriors all laugh at the irony as the episode ends.


  • The original French name for this episode is Tarentule au plafond, which translates to Tarantula on the Ceiling in English. The title is a spin on "avoir une araignée au plafond", the French version of the English expression "to have a screw loose".
  • The Holomap pictured on the title card for this episode depicts Lyoko without the Forest or Desert Sectors, which were both destroyed in the episodes Lyoko Minus One and The Pretender, respectively.
  • The inside of a way tower is somehow unique, as Ulrich is able to identify it without having seen the exterior color.
  • This is the only episode in which Mantas use their hallucinogenic beam.
  • The play performed in this episode, Cyrano de Bergerac, is a real play written by Edmond Rostand.
  • Room 237, where Ulrich and Odd were hospitalized, is the same room that Sissi was assigned to in Contact. Additionally, the doctor who attends them is the same doctor that X.A.N.A. took control of.