In the Mountain Sector, Yumi, Ulrich, and Aelita defeat three Bloks and the Scyphozoa, each showcasing their special abilities in the process. Odd, who does not have a Lyoko power, gives a lackluster performance, and admits that he is beginning to feel jealous of the others. The next morning, Jeremie announces he has programmed Odd a new ability: Teleportation.
The group returns to the Factory where Odd and Aelita are sent to the Mountain Sector. There, Jeremie coaches Odd on how to use new ability. However, there is a flaw in the program, and Odd inadvertently creates two copies of himself in the process. When Odd is manually devirtualized, it is revealed that the copies are real, flesh and blood clones. Aelita suggests the two clones stay in the Factory to avoid raising any suspicion at school, but the Odds reject the plan, and all three return to campus. Jeremie stays in the Lab to try to find a solution.
Although they are not discovered, Odd and his clones begin causing trouble for Kadic faculty members. When none of the Odds want to go to class, they argue and stop cooperating with one another. One clone truants and goes into town, the other is forced to go to class by Jim, and the original truants in the park. Meanwhile, Jeremie discovers the three Odds are incredibly unstable, and could atomize at any moment. He calls the original on his cell phone and advises him to gather the clones and meet in the Factory so that Jeremie can fuse them back together.
However, X.A.N.A. activates a tower and sends a spectre to campus. The spectre fuses with the asphalt of the campus's race track, creating a gray cloud of smoke that causes those who come into contact with it to be turned to stone. The smoke advances on Ulrich, Aelita, and the Odd clone in gym class, and the clone is petrified. Ulrich calls Jeremie to inform him of the attack before he, Yumi, and Aelita travel to the Factory. The original Odd is informed of his clone's petrification, and leaves campus to find the other clone in town. Meanwhile, Yumi, Ulrich, and Aelita are sent to Lyoko.
Odd finds his clone and tells him about the X.A.N.A. attack. They return to campus together, avoiding the smoke by climbing to the roof of the Science Building. They then use a fire hose to pull the petrified clone up to them. Meanwhile, in the Mountain Sector, Aelita, Yumi, and Ulrich are confronted by a Megatank, and Yumi is devirtualized before two more Megatanks appear.
On campus, Odd and the clone use the fire hose to swing into the park, evading the smoke once again and traveling to the Factory. Meanwhile, Ulrich and Aelita battle the Megatanks, and Ulrich manages to defeat two before being devirtualized. The three Odds make it to the Factory as the smoke spreads through town. Yumi and Ulrich arrive at the bridge, and carry the petrified clone down to the Scanner Room, where Jeremie fuses Odd and the clones together and sends him to Lyoko.
The smoke enters the Factory as Odd saves Aelita from the last Megatank. He then defeats two Bloks in succession, allowing Aelita to enter the activated tower just as the smoke infiltrates the Lab. She deactivates the tower, causing the smoke to vanish and allowing Jeremie to perform a Time Reversion.
In the lunch room, Jeremie reveals he has fixed the Teleportation program, and offers to give Odd the newer, bug-free version. Odd declines, claiming not to need a power to be an effective Lyoko Warrior, adding "in fact, you could say that I'm one of a kind".
- The original French name for this episode is Triple sot.
- It was originally titled Three is an Odd Number.
- This episode and the one following, Double Trouble, are very similarly named in the English version of the series. It is unknown whether or not this was intentional.
- In this episode, Yumi has the shortest trip to Lyoko in the whole series, being devirtualized after only 20 seconds.
- When the Odd clone reads the movie magazine in town, he calls the movie Wheelchair Zombie Four, but when the real Odd reads the same magazine, he calls it Surfer Zombie Four.
- While the clones are hanging from a tree in the park, the clone tied to a fire hose had two pairs of legs.
|Code Lyoko: Season 3|
| Straight to Heart | Lyoko Minus One | Tidal Wave | False Lead | Aelita | The Pretender | The Secret | Temporary Insanity | Sabotage | Nobody in Particular|
Triple Trouble | Double Trouble | Final Round
|Season 1 · Season 2 · Season 3 · Season 4 · Code Lyoko Evolution|