No one in the gang believes Kelso's claim that he hooked up with Brooke, a beautiful and conservative older girl, at a Molly Hatchet concert. Much to Kelso's shock, Brooke denies knowing him and rejects all of his advances. Brooke's presence also disrupts Jackie and Hyde's relationship when Jackie asks for his opinion about Brooke's looks. Also, Fez decides to pursue college-bound virgins while Eric learns of an interesting collection kept at the local library.
The Kyles and Vanessa's parents escort her to her first ultrasound. When asked if they wanted to know the baby's sex, Michael is the only one who stands out with a positive answer. Obsessed with knowing whether he's having a grandson or a granddaughter, he tries by all means to have the doctor tell him. He finally assumes it's a boy, and tells Jay and eventually the rest of the family. But in the end the situation reverses as they all confirm with the doctor the real sex of the future Kyle and leave Michael out in the rain. Meanwhile, Franklyn freaks out with the idea of losing Kady to ""Smilin' Willie"" and tries to learn how to be a dance master.
Jack helps save a Prince and Princess whose ship has been shot down to Earth by Aku.
It's Thanksgiving time in ‘the O.C.' It's time for family reunions, and Ryan gets called home by his family. Is it because of the holiday, or is it for a favor? Marissa decides to go along for the ride, but ends up going down Ryan's bad-memory lane instead. Seth plays the player role, but not very well.
Lex locates Morgan Edge and gets him to admit to dirty dealings with Lionel, but before Lex can take it to the authorities, someone tries to kill him at the mansion. Barely surviving, Lex flees and asks Clark for help. However, when Clark returns to the mansion to investigate he finds nothing amiss, and begins to wonder if it really happened, especially after Lionel announces Lex has had a psychotic break and must be institutionalized.
When Trip suffers a catastrophic injury, his only hope for survival is a transplant from a "mimetic symbiont" which Phlox grows from one of his exotic creatures.
A new student, Gary Harrison, joins the 4th grade. Gary is a Mormon from Utah. The children decide he needs to get his ass kicked, and they choose Stan to do it. After an awkward exchange of words, Stan is invited to Gary's house, where he learns all about Mormons.
Michelle is torn by personal and professional obligations when she must take charge of CTU after Tony is wounded. Kyle and Linda are captured by Hector's men. Jack and Palmer have a secret conversation, leading Jack to take drastic action in the face of the Salazars' threat. But Jack's plans are complicated when Chase gets in the way. Anne pushes Palmer back onto moral ground in the face of her ex-husband's blackmail scheme.
This episode demonstrates the production processes for prepared mustard, violins, nuts and bolts, and toilet paper, and shows how each is made.
Emily realizes that Richard has been secretly meeting someone for lunch for years. Lorelai accepts an invitation to dinner.
After fighting with his father and Haley, Nathan succumbs to the pressure he is feeling and takes amphetamines to help his game. However, he isn't prepared for the destruction the drugs do to both his body and his family. Meanwhile, Peyton goes to Lucas to rekindle their relationship, but when she arrives at his house, she catches him with Brooke.
A decomposed body is discovered in a tub of acid at a naval base and Ducky and Abby learn that the victim was a submariner. Gibbs discovers that there have been no reports of a sub crewmember missing, so he deduces that one of the subs has an imposter on board. With this new information, the team must find out which sub the man posing as the victim is in and what intentions he may have towards the sub.
Cate persuades Rory to try out for basketball because that would've made his dad proud.
Cheryl cajoles Jim into attending a couples cooking class, which turns into a disaster, so she lets Jim pick out the next couples activity – paintball.
Lilith comes to town for a one-day conference. She and Frasier try to get together, but keep having to cancel. Lilith discusses her romantic problems with a colleague at Cafe Nervosa before having to return to the conference.
A subway commuter is found castrated and bleeding profusely, leading the detectives to discover their "victim" may be the perpetrator in abducting women and forcing them to live in his dungeon for several years as his bride. As the detectives prepare to arrest their victim turned suspect, Benson arrives to find him murdered.
When another woman is murdered by the serial killer, the detectives arrest a suspect... and discover the killer's identity; and expecting a baby, Sipowicz and McDowell decide to get married.
WYNX has a new producer named Geraldine. Geraldine has fired the old producer Hank and hired a new sidekick named Holly to help Flex out with the Flex Files to increase ratings. Holly at first seems like a dumb blonde, but she later on proves her inelligence to Flex as she proves that her ""dumb-blonde"" act is just a tease she uses to help get more viewers. Meanwhile Duane finally meets his father, but it turns out that he's only come because he needs Duane's kidney. Also Breanna tries to figure out who Arnaz lost his virginity too, while Spirit works on a unique design to get her way into a fashion college.
Dr. Brown courts Linda Abbott despite Edna's and Harold's insistence that he's wasting his time, but Andy persists, forcing Linda to tell him that she is H.I.V. positive. Bright tells Ephram he can win Madison's affections by ignoring her, but the plan goes awry when she breaks up with her boyfriend. Amy meets a flirtatious and attractive town bad-boy, Tommy Callahan (guest star Paul Wasilewski), whose compassion for her problems touches her heart for the first time since Colin's death.