|Air Date (US)||April 19th, 2004|
|Air Date (France)||September 3rd, 2003|
|Written by||Frédéric Lenoir|
|Storyboard by||Thomas Astruc|
|Followed by||Seeing Is Believing|
|Xana Attack||Possesion of Amelia's Teddy Bear|
Milly and Tamiya are doing a report on the school prom. They try to interview Sissi, who was prom queen last year, but she turns them down and makes fun of their age. Milly tries to ask Ulrich out, and he turns her down because he's going to the dance with Yumi. Upset, Milly storms off. In her room, she tells Tamiya that she hates everyone, unaware that X.A.N.A. is listening from her computer. When Milly tells her teddy bear that she wishes she were bigger and leaves it in the garden shed, X.A.N.A. possesses it and uses it to attack those who had made fun of her. It then increases the teddy bear's size to roughly two stories and sets it on the town. Since Ulrich had to protect the school and warn Yumi, it's up to Odd to go to Lyoko and help Aelita deactivate the tower protect the rest of the town from the rampaging teddy bear. After a return to the past, Milly asks Ulrich to the dance again, and Ulrich says yes, embarrassing Sissi.
- The original French name for this episode is the same as the English.
- Aelita does not sense Pulsations in this episode.
- The activated Tower's red aura is very faint in this episode.
- The loading time for Odd to get into Lyoko is only a bit less than a second. In later episodes it is 2–3 seconds.
- Odd says "Impact" after defeating a monster. After this episode, this line would be used exclusively by Ulrich.
- The scene when Odd volunteers to go to Lyoko is used in the season 1 title sequence.
- It is very unlikely that Ulrich would beat the teddy bear to Yumi's house since he was simpily following the bear's tracks.
- This episode is the real first appearence of X.A.N.A. not Garage Kids.
- This marks the first appearances of the Megatank and Kankerlats
- This is the first time the Desert Sector was shown, making it the first sector shown, in terms of production order.
- Ulrich and Yumi almost had their first kiss in the end of the episode before the "Return To The Past".
- When Jeremie is loading Odd's Lyoko ID Card all of the other cards are all of Odd instead of Yumi and Ulrich.
- On Cartoon Network.com the name of this episode is Teddygodzilla (possibly mistaken from Code Lyoko the Adventure begins with the name error Teddy-Godzilla)
- When the Roachsters are first seen, there are only four of them, but soon after that all five are seen.