It's holiday time at Kadic and everyone is headed home. Aelita, however, has no home to go to. As she watches over Lyoko, she gets a message from Franz Hopper, who has constructed a simulation bubble of their mountain home on Lyoko. Though happy to see her father, Aelita quickly learns that the entire thing is a trick from X.A.N.A. – her father is just an illusion in the simulation bubble on Lyoko. William is there waiting for her in order to throw her in the Digital Sea. However, she escapes resulting in William chasing after her. The rest of the group, having been unable to contact Aelita, follows her onto Lyoko, but they fail to keep William from throwing her into the Digital Sea. When it seems as though Aelita is gone for good, she is lifted from the sea by the real Franz Hopper, who has manifested himself as a floating white bubble with a pink aura. After dropping her back on Lyoko, he returns to the Digital Sea.
Moss decides to try and work out exactly when Roy will die by using a website on the Internet that calulates time of death based on the answers given to certain questions. Roy doesn't want to know anything about it, but Moss spills it anyway, making Roy very nervous.
Telly stares in awe at the Triangle Triple Crown, which will be worn for three weeks by the "Triangle Lover of the Day" at today's Triangle Lovers' Club meeting. He loves triangles more than anyone else, so he is sure that he will get crowned, and he invites Baby Bear to the special occasion. Baby Bear is not sure he will fit in with the other Triangle Lovers, since he doesn't call himself one, but Telly reassures him that he'll do fine.
Mum, the children, their aunt and grandfather get stuck in a traffic jam on the A3.
Jeremy has developed a program to make the William clone smarter, but the learning curve is still problematic, as it tries to fling a glass into the air from a fork. Milly and Tamiya, overhearing the group's conversation about the clone, decide to ask him personally. The clone, having never been told to keep the information a secret, reveals everything to them, and even takes them to the factory. Meanwhile, Jeremy plans a mission to the next Replika, a copy of the Desert Sector. During the trip, William emerges from a scanner and tries to destroy the supercomputer. With the help of Milly, Tamiya, and the William clone, he is defeated, and a return trip keeps Milly and Tamiya in the dark about the Supercomputer.
Jim's nephew, Chris, the drummer of the Subdigitals, pays a visit to Kadic to look for an opening act for the band's next concert. Everybody tries out, and Aelita turns out to be the one Chris is looking for. However, circumstances make sure that Chris does not realize who Aelita is, and X.A.N.A.'s clone of him only complicates matters, kidnapping Aelita and sending her to Lyoko. Jim and Chris manage to involve themselves in their search for Aelita, and end up battling the clone while the rest of the group tries to deactivate the tower. After the threat is over, Jeremy executes a return trip so that Jim and Chris remember nothing. He also delivers Aelita's demo CD to Chris personally after doing so.
A mysterious man called the Medicine Seller travels along feudal Japan, uncovering and slaying evil spirits called "Mononoke".
OCC hovers over their next project--a sleek, custom creation for Silver State Helicopters. But aspects of the bike's design present new challenges for the crew, and forces Paul Jr. to confront creative obstacles of his own.
As our Heroes continue towards Hearthome City, Ash reunites with his old friend and rival, Gary Oak. However, they have to work together in order to save a rare Shieldon from the evil clutches of Pokémon Hunter J.
Roger joins Don for an evening of dinner and drinking, during which Roger's behavior leads to a rift in their friendship. Though Don accepts his apology, there are further consequences for Roger. Pete faces trouble at home as he continues to struggle with the demands of his new marriage.
The MythBusters are wearing their underpants on the outside. And why? Because this is Superhero Hour! The MythBusters test the Batmobile's 90-degree turn, the grappling hook, and ring punch.
Tommy goes on another memorable date with Beth for the sake of the crew; Black Shawn proves himself in an unexpected arena; Franco realizes what he's really lost while Latrina shows she knows how to keep Lou happy; Dad gives Tommy some insight into his childhood
Odd tries to take Kiwi to Lyoko, but ends up absorbing him instead. As a result, Odd slowly begins to take on dog traits, such as enhanced smell and scratching himself with his foot. While Jeremy works on separating the two, X.A.N.A. possesses a biker gang to attack Yumi. When Ulrich and Aelita arrive to Lyoko, they are confronted by William and three Tarantulas. Jeremy manages to split Odd and Kiwi while Aelita deactivates the tower.
Having failed to destroy X.A.N.A.'s supercomputer in the Amazon, the group sets out to finish the job. Meanwhile, Odd's bragging gets the better of him, and he makes a bet with Ulrich not to brag for 24 hours. However, circumstances conspire to constantly put him in the spotlight, and when he ultimately both defeats William single-handedly and destroys the supercomputer in the real world, Odd becomes convinced that being a braggart is something he can be proud of.
Dad strays into a job-threatening controversy, while Mum starts a turf war.
Oscar and Grundgetta are reading The Tale of Sleeping Grouchy" and Slimey, Telly and Elmo join them. The story begins, "Once upon a time, there was a very, very, very grouchy princess . . ." and it tells the tale of a princess that was so grouchy, she said things like, "Phooey!" "Ewwww!" and "Sounds horrible!" One day the grouchy princess was on a grouchy walk. She said, "Phooey!" so many times that it disturbed a wizard who was walking nearby and he cast a spell on the her, putting her to sleep for a hundred years! Princess Grouchy's parents were very upset. They loved their grouchy daughter dearly and wanted to find a way to break the sleeping spell. They offered a reward to any prince who could wake the princess up. Prince Elmo came and tried to tickle Princess Grouchy awake with a feather, but it didn't work. Prince Telly played his loud tuba with his back-up band, The Cat's Meow, but Princess Grouchy still did not wake up. Finally, Prince Slimey arrived.
Harry suspects the Ministry of Defence may be covering up the true cause of the helicopter crash, but he's determined to get to the truth.
It is graduation time at Beverly High, but just as the ceremony gets underway, the entire graduating class, including Sam, Clover, and Alex, mysteriously black out. When they wake up, they are surprised to find themselves back at school.