The annual holiday of Yam Weem is upon the gang and, when names are picked from a skull for a gift exchange, Poe's name accidentally goes missing.
Maddie is back and is not getting along with Nia, while Estaban is not getting along with Patrick, and the rest of staff aren't getting along either. So, Mr. Moseby hires a professional to help the team get along. Meanwhile, when Zack causes some customers to leave, he and Cody schedule a bug convention at the Tipton to make it up to Mr. Moseby. However, due to his fear of bugs, he accidentally releases the bugs into the Tipton.
The Sheriff and his sinister scientist, Joseph (pretending to be the Nightwatchman), test a poison, blaming the ill effects on the pestilence.
When only one applicant makes it through the Legion testing, Superman decides to recruit a new member: the non-powered master of martial arts, Karate Kid.
Torbin Zixx persuades the turtles to help him recover an experimental matter transmitter.
Aelita finds a photo of herself with Franz Hopper at the Hermitage, with a mathematical equation in the background. Jeremie discovers that the program works as a reset feature to Lyoko, something not too helpful but useful nonetheless. Meanwhile, Odd, in an attempt to impress a girl in photography class, inadvertently sends the photo to Sissi, who in turn shows it to her father. He questions the group about it, with Jeremie pointing out that Aelita would obviously be twenty-four by now if she were the one in the photo. They are sentenced to dentention in the library by Jim before any more discussion occurs. Before he can follow up on the matter, Jean-Pierre possessed by XANA. He delivers Aelita to Lyoko, where the Scyphozoa is waiting for her. It takes control of her and tries to force her to walk into the digital sea, but Ulrich and Yumi are there to keep her from doing so.
A hot-shot group of Chaotic players, dubbing themselves the ChaotiKings, offers Kaz a chance to join their prestigious clique. Torn between friendship and popularity, Kaz sets out to become the ChaotiKings' newest member – if he can survive the initiation.
Mick hunts a teenage vampire who is preying on female escorts he finds on the Internet. Meanwhile, Mick and Beth try to avoid each other after sharing an intimate moment.
Skull Boy, as the great showman PT Cranium, decides to hold a Pet Talent Show. Everyone rushes to rehearse fabulous tricks with their pets except for Poe who, sadly, doesn't have one.
Vicki keeps waking up on the same day and time with a chain of events happening over and over again.
Trouble is in the air as the Setori's start to suffer and the JuiceNet is endangered by a new bar. But when Lewis finds a book of mermaid spells, the girls attempt to use a potion to fix everything. However, things aren't so easy when you have special powers.
The tale of Avatar Roku and Fire Lord Sozin is revealed to Aang and Zuko by different sources. Both learn about themselves and are shown the origins of the war.
So she could go on a date, Alex uses a magical pocket elf to pass an exam for Spanish. However, a chocolate-devouring pocket elf is sneaked into her purse in a plot divised by her brothers.
Tim and Jason go to Mexico as Street hopes to explore experimental surgery. Riggins, who is worried about Street, turns to Lyla Garrity, who's busy helping a newcomer acclimate to Dillon. Meanwhile, Coach Taylor decides on a big career move that will change his life. A development in a police search deeply affects the lives of Tyra and Landry.
Robberies the storybook hero would have been proud to claim plague Don and Charlie as they attempt to catch a do-good thief who is donating his spoils to charity.
Two of Cooper's billionaire friends come to the Montecito for a visit and a poker game. Cooper decides to shadow Sam to better understand her work only to scare off one of her clients. Piper tries to scare everyone with her variety of Halloween costumes.
After a visit to the hospital, Jimmy reveals feelings no-one knew he had - least of all Jimmy.
After a popular ultimate fighter commits suicide, an investigation reveals he had been the third fighter in the league to commit suicide and the league CEO had been pushing steroids on the players. Following the results of the investigation, Sebastian charges the CEO with murder.