Sebastian and Danny travel to Mexico to attempt to retrieve a defendant who left the country to avoid being prosecuted for murdering his business partner/mistress.
Jen gets promoted to Assistant Coach at The Penalty Box, only to order too much wrestling merchandise from a marketing representative when she develops a crush on him. Jen needs to sell the wrestling gear while her job is still on the line, so Jonesy, in his Wrestling name "The Stud", lends a hand along with Jude and Wyatt as color commentators. Meanwhile, Nikki's ex-boyfriend Stone returns to the mall so Nikki tries to get over him, with Caitlin's help.
After a miserable ride to London, Ewan and Charley push on to France. Despite arduous weather conditions, they must stay on a strict time course.
Stan seeks out Francine's birth parents because her visiting adoptive parents annoy him so much. But they don't annoy Steve, especially after they give him fireworks.
Ben Stillman arrives at Heartland and his treatment of his horse Red angers everyone. Ashley lures Ty to Briar Ridge with a job offer.
Larry tries to use Cheryl's therapist to get back into her good graces after getting bad advice from his own; Larry's miffed at Marty's participation level in an Alzheimer's walk
Kitty gets a visit from an old friend to do some damage control regarding her pregnancy. But it doesn't go as planned. Sarah is struggling with Paige, while Justin is down.
Lois and Peter sail off on a cruise. Jealous that he was left behind, Stewie's matricidal tendencies are rekindled. When Brian challenges him to actually do it, Stewie carries out his diabolical plan.
Zoey starts dating Dean Rivers' son. Meanwhile, Logan makes a dance video for girls so they can dance with him from the TV. Chase and Michael struggle to make 26 more cartoons for the end of the month, and end up getting sued by Friday Night Live for their idea of two bowling pins afraid of a bowling ball rolling towards them.
When Burbury, Connecticut is infected with a strange virus, Xavier must use his healing powers to save the town from an evil computer.
The series' 18th Halloween show features three vignettes that parody movies: one that spoofs "Mr. & Mrs. Smith"; one that sends up "E.T."; and one that parodies "Se7en."
This is the show's first Halloween episode. Edie Britt's biggest fear comes true when Carlos walks out on their relationship. Susan finds Mike's father, who was supposedly dead. Danielle goes into labor right in the middle of the Halloween party... and somebody has to deliver the baby.
A copy-cat killer follows the lead of the "Bay Harbor Butcher." Dexter must destroy an incriminating surveillance video.
After a massive shootout at a Duncan Hills Coffeeshop opening, Dethklok invest in the ultimate protection - another Dethklok. But are these dopplegangers really all that they seem?
The topic for the next iCarly webcast is figuring out what mean teachers do outside of school. When Carly and Freddie follow Ms. Briggs home, they get stuck inside her house.
Johnny is upset because the holidays that give free candy to the world are spread too far apart, so Johnny decides to start his own holiday, known as Kids Get Free Candy Day, and try to spread free candy. When there are some adult protests against this holiday, Johnny, Dukey, Susan, and Mary gain an unlikely ally against this – the Beekeeper.
Chameleon Boy infiltrates Imperiex's ranks as Persuader. But something goes horribly wrong.
Batman and Robin team up with the Flash to thwart Mirror Master's plans to trap everyone in their own mirror image.
When an embarrassing picture of Yumi is printed in the Kadic newspaper, she turns to Odd as the source. He manages to get Ulrich to take the blame, however, causing tension between him and Yumi. Putting that aside, Jeremie sets up a mission to the next Replika, a copy of the Ice Sector. Its supercomputer is located in Siberia, where XANA is growing brains for an unknown purpose. Odd and Yumi are sent to the real world to destroy it, only to be confronted by William. When trying to shut down the tower, Aelita realizes that the data it is generating could be used to free William. After downloading the necessary data and disabling William, everything seems to be set for destroying the Replika. However, XANA draws on the power of his many Replikas to create a new monster: the "Kolossus," a massive creature resembling a fire elemental with a sword for a hand. It easily devirtualizes Aelita and Ulrich, and nearly destroys the Skid, as well. With this new development, and the realization that XANA has hundreds of supercomputers at his command, Jeremie has to change strategies. Meanwhile, Yumi forgives Ulrich for the picture, and Odd admits to his deception soon after. Yumi gets back at both of them by getting a picture of the two coming out of the shower in the paper.
Odd is presenting one of his films, but is unhappy because his parents are coming. According to him, they never find fault in anything he does, which he finds dissatisfying because he isn't treated like a normal teen. However, when he's finally pressured into it, XANA attacks, using the school's cell phone antenna to spread a virus to everyone who answers their phone to cause them to become vicious, angry mind controlled slaves , starting with Odd's parents. With the widespread use of cell phones, all but the Lyoko warriors and Sissi are affected, Sissi having had her phone accidentally broken by her father. While she and Odd attempt to evade the possessed students and faculty, the others deactivate the tower in the Mountain Sector. Once a return trip wipes everyone's memories, Odd plays his video, which showcases all the humorous moments at Kadic, with Sissi in particular being treated in a positive light as thanks for her earlier assistance, much to her confusion.