The episode starts with Yumi and Aelita going to a Tower in the Ice Sector after Jeremie senses something wrong with it. Aelita checks it out, but unbeknowst to her or Jeremie, Yumi is kidnapped by X.A.N.A. and placed inside a Guardian. Jeremie, seeing that Yumi is not onscreen at the Lab, proptly tells Aelita to stay in the Tower so he can scan for things. However, Yumi (who is actually a clone created by X.A.N.A.) is seen suddenly to emerge from one of the scanners, and faints. Jeremie, Odd, and Ulrich take her to the Infirmary.
When X.A.N.A.-Yumi awakens, and Yolanda tells her to stay put, she throws the helpless nurse out of the way. After conversing with her friends as well as Sissi, she is beckoned by Mr. Delmas, who wants to call her parents for attacking Yolanda. X.A.N.A.-Yumi, showing the white glowing Eye of X.A.N.A. on her forehead, knocks the principal unconscious with the phone and goes to Jeremie's dorm to see if she can convince him to get her to the Scanner Room. Jim tries to act friendly with her but X.A.N.A.-Yumi ignores him, much to his confusion.
Meanwhile, Aelita discovers a Guardian. It is being guarded by Roachsters, however, and she is nearly killed. After running back to the Tower pronto, she tells Jeremie of the situation.
Back at the school, after Jeremie stops talking to Aelita, X.A.N.A.-Yumi decides she wants to go to the Scanner Room, so she tries to seduce Jeremie to convince him to arrange a mission, who resists to the occasion, rather scared by it all. She fails, but Odd and Ulrich stumble upon the scene, and when Ulrich sees X.A.N.A.-Yumi trying to kiss Jeremie, he is outraged and heartbroken. Jeremie tries to explain, leaving Yumi alone. Jeremie apologizes for the incident, citing Yumi's strange behavior and he tells them they should go to the Factory to help Aelita.
When they head back to his room, they find his computer destroyed. Yumi seems the likely culprit. She shows up to meet them, still wanting to go to Lyoko. Having no choice, they go, and X.A.N.A.-Yumi chuckles evilly to herself.
At the Factory, Ulrich and Odd go to Lyoko, but X.A.N.A.-Yumi pushes her Scanner door open and tries to disconnect the Scanners from the Supercomputer by pulling their plugs. Jeremie notices and goes to the Scanner Room to see what the problem is.
It is then finally revealed to the heroes that the Yumi on Earth is a clone created by X.A.N.A.. She knocks out Jeremie, and continues trying to disconnect the scanners, after laughing evilly.
In Lyoko, Aelita figures out a way to defeat the Guardian. She creates a clone of Yumi via her Creativity. The Guardian gets confused and tries to absorb the clone Yumi too, but this is beyond its ability and it explodes in a brilliant flash, releasing Yumi.
Yumi volunteers to return to the Factory, but Ulrich points out that without Jeremie, they can't be devirtualize. Yumi tells him "You're armed, aren't you?".
Jeremie wakes up, but the hatch leading to the Supercomputer Room was torn off by the X.A.N.A.-Yumi. Jeremie pushes X.A.N.A.-Yumi into the the hole. However, she grabs Jeremie and tries to throw him in. Aelita deactivates the activated Tower, killing X.A.N.A.-Yumi and making her vanish (this is not seen). Then, a time reversion envelops everything, saving Jeremie from certain death.
Back in the past, the real Yumi pretends to seduce Jeremie again as a joke, but Ulrich stops her.
- The original French name for this episode is Problème d'image.
- This episode introduces several "firsts" for the series:
- This episode marks the first appearance of the school nurse.
- Yumi's surname is mentioned for the first time.
- X.A.N.A. uses the scanners to stop the Lyoko Warriors for the first time.
- The first appearance of the Guardian.
- This is the first time a member of Team Lyoko devirtualizes another member.
- The first time X.A.N.A. lures the Lyoko Warriors to Lyoko by activating a tower.
- The first time a Polymorphic Clone is used.
- This is episode 2 of the week dubbed "Pick on Yumi week".
- This was the first episode, in terms of production order, that Bruno Regeste worked on.
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|Code Lyoko: Season 1|
| X.A.N.A. Awakens | Teddygozilla | Seeing Is Believing | Holiday in the Fog | Log Book | Big Bug | Cruel Dilemma | Image Problem | End of Take | Satellite|
The Girl of the Dreams | Plagued | Swarming Attack | Just in Time | The Trap | Laughing Fit | Claustrophobia | Amnesia | Killer Music | Frontier | The Robots
Zero Gravity Zone | Routine | Rock Bottom? | Ghost Channel | Code: Earth | False Start
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