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In the series pilot, social opposites Sam and Brooke are paired as lab partners, to the delight of Carmen, who sees it as a chance for Sam to help her get on the cheerleading squad. Meanwhile, Brooke and Nicole plan the first party of the school year and star quarterback Josh tries out for the school play.

Carmen ditches school the day after the cheerleading roster is posted, and Lily refuses to dissect a frog in science class. Meanwhile, Josh's father embarrasses him at rehearsal; and Mary Cherry stalks Nicole.

Sam writes an exposé about the cheerleaders' school budget, leading to the squad's termination and its remaining funds being redistributed to the drama department. The exposé also heightens the tension between Brooke and Sam as they prepare for their first dinner together with their parents. Meanwhile, Josh must decide between starring in the school musical or playing in the homecoming game.

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.

Members of the cheerleading squad agree to attend Carmen's slumber party, causing Sam to question their motives. At the party, Nicole tries to impress Carmen's older brother, Leo, and a party game takes a disturbing turn.

Sam discovers that Nicole, Poppy and Mary Cherry stole the answers to the biology midterm, and she sets out to gather the evidence she needs to turn them in. Meanwhile, Mike and Jane's sneaking around angers Brooke and Sam.

Brooke, Poppy, Mary Cherry and Carmen are nominated for the Junior Court Homecoming Queen and Nicole pressures two of Brooke's opponents to halt their campaigns. Meanwhile, Sam and Jane move into the McQueens' house, causing an instant turf war between Brooke and Sam.

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.

The students embark on finding nominees for "Principal for the Day," while a custodial strike leaves the school a mess. Meanwhile, Brooke fears she may be pregnant; and Sam, Carmen and Lily discover something personal about Harrison's mother.

Brooke and Sam are forced to hold their annual Christmas parties together, and Carmen is injured just weeks before the next round of cheerleader tryouts. Meanwhile, Nicole's brooding over the yuletide season leads to visits from the ghosts of Christmas past, present and future.