Sam and Josh have an embarrassing encounter during a play rehearsal, starting rumors that they are interested in each other. Meanwhile, Brooke confesses to Nicole that she and Josh are still virgins, and Harrison's hope for a relationship with Brooke gets a boost when she turns to him for comfort.

Sam and Brooke wager on whether or not Sam can land a boyfriend by the end of the week and whether Brooke can prove that her relationship with Josh is more than just physical, with the loser publicly joining an embarrassing club. Meanwhile, Lily hands out condoms to her classmates in response to the popularity of a new singer whose sexual image is mimicked by some students at Kennedy High.

Mounting tensions between Sam's friends and Brooke's clique lead to a proposed rumble, but the guys intervene and lock the ladies in a school bathroom in an attempt to make them reconcile. Meanwhile, Josh, Harrison and Sugar Daddy get an education on ovulation from a nature film provided by Bobbi Glass.

When Sam, Lily and Carmen dye their hair blonde to prove that the popular girls' power is based on their hair color, Brooke and her friends set out to prove them wrong by darkening their own tresses. Meanwhile, a beautiful, new exchange student is attracted to Sugar Daddy.

Sam runs away from home and hunts for Brooke's mother, with the hope that the woman will help her put an end to Mike and Jane's wedding plans. Meanwhile, Josh, Sugar Daddy, Harrison and Emory Dick go to a strip club with fake IDs.

Brooke bonds with her long-lost mother--much to her dad's chagrin. Meanwhile, Lily and Sugar Daddy try to save a tree from being cut down, and Carmen delays telling her friends about her pregnancy.

Nicole is desperate to save her popularity, which is falling since she was banned from the Glamazons. She tells Brooke that she should dump Josh and start dating George. Harrison is feeling a little bit jealous about Sam and George flirting, and so he and Nicole team up to make a study on attraction for chemistry class. Brooke and Josh break up. Sam feels like she lost again to Brooke when she sees she and George together. But George tells Sam he is really into her and they kiss. Josh and Lily find themselves attracted to each other when he helps her to send a gay chimp back to his lover in Uganda. Harrison learns more about Mary Cherry and starts to have feelings for her (could it be love?). Jane tells Mike she's pregnant.

After Harrison returns to school since he had his bone marrow transplant, he acts in a weird way, making everybody think he's possessed or something. The girls think about it and conclude that he has impersonated Nicole's personality, since she was the donor. They decide to call a priest to exorcise him. Meanwhile, Josh and Lily's relationship is growing so much that there's hardly any space left for Sugar Daddy in Josh's life. Feeling neglected, he finds a new friendship in George. They enjoy each other for a while until George feels like Sugar is demanding too much attention. Josh and Sugar make up. Nicole finds out she's adopted after she asks her mom about her birth and she doesn't give clear information. Shocked, Nicole finds out that her mom was a 16 year old cheerleader, and tries to find her with no luck. Both Nicole and Harrison conclude they have to find themselves.

Nicole's mom is not so happy about her spending time with her birth mom. Judy Julian tries to bribe Nicole's mom so she would disappear. Shaggy leaves and Nicole and Judy become closer. Meanwhile, the girls are bored with the immature behavior of the boys and their boring lives as high school students. Brooke meets a college girl who invites them to a college party. Sam and Lily are stuck at home for lying about where they where going and spend up playing board games with Sam's parents all night. Carmem meets a boy and goes up to his room. Feeling that something might happen, she hides inside the closet until the boys come to rescue her. After their experience at the frat party, the group learns that high school isn't so bad after all.

With a lot of power in her hands and not so many brain cells in her head, April Tuna is ordered by Principal Krupps to cut one of the school's clubs. April becomes an easy prey for Evil Nicole (still out of the Glamazons and thirsty for revenge), who manipulates her into cutting the Glamazons off. April and Emory have a small fight when she threats to cut the ""John Travolta-inspired Staying Alive"" club, for which Lily, Harrison and Josh compete to be president of. Meanwhile, Brooke gets in deep trouble after she doesn't come home from Jamie's, which causes Mike to get furious and ground both Sam and her for lying. After Jane talks to him, he finally decides to give Jamie a chance and invites him over for dinner. Back at KH, Emory blackmails Tuna in order to save his club, and she ends up losing the position of student body president to Nicole, who immediately cuts the Glamazons, replaces it with ""Bring It!"", the new pep squad with her as the big star, and shuts the John Travolta club,

Sam and Brooke help deliver Jane's baby (in one of tv's fastest labors) and realize that they can't fight over Harrison, so they both agree on going with him to the prom (ménage?). Nicole is thirsty for revenge and gets George into asking her to the prom, since he is hurt by what Sam's doing. Josh and Lily are trying to handle their marriage, and decide they should get a place of their own, since Lily's mother disapproval has become unbearable. So they move to the now available Ms. Glass's basement. But they have too much pressure on their hands, since Ms. Glass is using them for house chores and they are totally broke, to the point of Lily having to sell organic soap at the school and Josh getting a job as a window salesman. And they're still trying to consume their wedding. Mary Cherry is touched by the sisterhood of Brooke and Sam, and decides she wants a sister too. She asks Nicole to be her sister, but the Devil turns down the offer. Suddenly, Mary Cherry's long lost twin sister (