When Animology sweeps over the school, Kim tries to avoid it, but she gives into the fad. Meanwhile, the Seniors start their most dangerous plot to date.
Barnaby investigates a death which looks very much like suicide. The dead man was a troubed and depressed gambler on a losing streak, but Barnaby's nose tells him to look for a murderer. During the investigation he recognizes someone from his past, in the shape of Dr Jane Moore.
A six-year-old girl is critically injured in an apparent robbery-gone-bad and later dies. The investigation gets complicated when it is discovered that the murders were designed to silence the young girl, who was sexually abused.
The girls audition for a television talent show with a bit of help from Sabrina's magic.
After Oswald fails his nursing school exam, Drew feels bad and helps him get a job at the web site. Oswald finds a way to nearly destroy the entire business. He ends up being reassigned to a job that he (sort of) knows how to do--delivering packages. Mimi repeatedly sucks up to Traylor in an attempt to get on her good side after trying to kill her.
The Delightful Children From Down The Lane attack Sector V's headquarters with an infestation of hair-eating lice. After the KND find out they don't like nacho cheese, they decide to shoot nacho cheese at them to get rid of them.
After accidentally returning to Earth, Crichton discovers it he is in 1985 and he has altered the time line, causing his father to be scheduled to fly on the doomed shuttle 'Challenger'.
The team is called into battle unexpectedly when the Asgard homeworld is overrun by Replicators -- which have evolved into a startling new form.
JT the class clown gets in trouble and spends the week afterschool with the hot science teacher Ms. Haztilakos but along the way he finds that she is a person not just a hot teacher and he earns her respect. Jimmy and Spinner are starting to tell the truth forever and end up with unexpected results.
Harold allows a boy scout troop to come to the Lodge and educate the men about the outdoors. Red puts s device in his mailbox to prevent junk mail from getting through. Walter has trouble when he tries to split firewood. Red builds a loveseat that expands into a full sized couch. Red installs a manhole cover on his engine for making giant waffles.
Reba suggests that the family create a time capsule and videotape private messages for Cheyenne's baby, Elizabeth. Unfortunately, privacy is thrown out the window and feelings are hurt when curiosity gets the best of everyone and they foolishly decide to watch the tape.
Naruto finally joins the battle on the bridge. But when Naruto stupidly gets caught in the middle of Haku's jutsu as well, he and Sasuke must work together to escape. Kakashi is unable to help them, as he must deal with Zabuza to protect Sakura and Tazuna. How will the two escape from the ice mirrors without any help?
Chandler starts looking for a job and is anxious about having a baby with Monica while uncertain about his career prospects. Meanwhile, Rachel visits work and finds out that during her leave, a guy named Gavin has been temporarily assigned to take care of her job. She starts to feel insecure about her job position and decides to come back from her leave early. Also, Phoebe works as an extra on Joey's TV show and brings even more drama to the set.
Dr. Pratt brings a gun into the ER; Dr. Weaver tries to conceal her pregnancy; a woman plots against her dying husband; Dr. Chen treats math students who overdosed on an unknown stimulant.
Deep in the woods, Ash spies a Treecko. He's wanted to catch a Treecko since he first saw one at Professor Birch's laboratory. He follows the Treecko to an enormous tree that seems to be dying. There, Ash's Treecko has an argument with all of the other Treecko. It seems that Ash's Treecko is very attached to the tree and wants to stay with it, while the rest of the clan wants to move on to a new tree. Ash watches as the lone Treecko struggles to save the tree. He and Pikachu feel badly for the Treecko and try to help. In the end, however, the tree dies and falls. Now that its home is gone, Treecko is ready to make a new home with Ash. He and Pikachu battle, and Ash catches his Treecko!
Comeuppances are in store for Dr. Cox, Dr. Kelso and J.D. from a hypochondriac, a surgical patient and Elliot, who wants more than just sex from J.D.
Grissom and Catherine investigate the grisly meat grinder murder at a slaughterhouse. Warrick and Sara look into the apparent suicide of a troubled young woman.
Annie Miller disappears on her way to school. The group looks into her disappearance, with their suspects ranging from the local mayor, to Annie's godfather, all the way to a young man working for the father of her best friend. Twenty-four hours after Annie's disappearance, her best friend Siobhan Arintero also vanishes, leaving only a collection of videos to help find the two girls.
As Ed takes the case of a injured high school football player who's suing another player for unnecessary roughness, he meets an enthusiastic law school graduate eager for a job; Eli helps Warren and Diane give Mark his last great meal before surgery; Molly does her best to be the coolest principal ever.
George is sick of being unappreciated by Benny, so with the urging of Angie, he decides to remodel his mother's run-down bathroom. Hoping for a simple thank you, George's plan backfires and Benny continues to be her ungrateful self. But after a much needed heart-to-heart, George and Benny realize their significance in each other's lives, and in turn express their gratitude.