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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.

Josh is pressured to quit the musical. Brooke comforts Carmen. Sam and her friends aren't invited to Glamazons' exclusive party. Sam and her dreamy teacher Luke have dinner. Lily still won't dissect a frog. Jane and Mike have big news.

Brooke and Sam are forced into dinner plans together with their parents; Sam's cheerleading expose ignites a war; Josh must choose between a football game or the school musical.

Josh has a spontaneous erection when Sam sits on his lap. Carmen accidentally sends everyone her e-mail about this embarrassing event. Harrison comforts hurt Brooke, while Sam and Josh bond. Lily's broke and finds a fast food job.

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

Animosity deepens when Brooke and Sam discover their parents have been lying to them; Sam tries to expose a cheating ring in biology class; a food fight breaks out.

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.

Brooke must prove her relationship with Josh isn't just about sex, while Sam must bag a boyfriend; Lily launches a condom campaign.

The students have to find nominees for Principal for the Day, while a custodial strike leaves the school a wild mess. Meanwhile, Brooke fears she may be pregnant, and Harrison has to deal with his mother being a lesbian.

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.

Josh's father forbids him to do the musical. Sam and Brooke are asked by a network TV producer to make a video piece on Josh. Now that Carmen is a Glamazon, April Tuna becomes her obsessive fan. The Glamazons take a driving test.

Emory puts the popular kids, Bobbi Glass and the lunch lady on trial for harassing him. Sam and Lily volunteer to represent him at the school's mock proceeding, which leads Principal Hall to ask Brooke to lead the defense. Meanwhile, Josh and Sugar look forward to the start of the wrestling season.

A Sadie Hawkins dance has most of the students obsessing over their appearances, while Brooke considers inviting a young man of substance. Meanwhile, Nicole, Poppy and Mary Cherry follow a dangerous crash diet: the one who loses the most weight gets to ask out the gorgeous guy they all pine for.

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.

Principal Hall forces Josh, Harrison and Sugar Daddy to attend a weekend sensitivity camp after they harass a scantily clad Lily. Sam and Brooke work on the school's crisis hot line and inadvertently heighten one of the caller's problems.

A new male student sets out to join the cheerleading squad, by any means necessary. Meanwhile, Sam bests Brooke in a modeling contest and nets an opportunity to appear in a commercial with U.S. Women's World Cup soccer stars Tiffeny Milbrett and Tisha Venturini.

A new vice-principal joins Kennedy High and his good looks draw the attention of the female students. Meanwhile, Brooke lies to Carmen about a tattoo she claims was inspired by Josh, so Carmen suspects that Brooke may want her old beau back; and Emory tells Harrison that a grade school music teacher was once impressed with Harrison's music skills.

Harrison campaigns to save the job of the school's shop teacher when the instructor's career is jeopardized by his announcement of plans for a sex change operation. Meanwhile, Cherry Cherry teaches a home economics course at Kennedy High as part of her community service sentence for punching a police officer.

Blonds and brunettes switch hair color to test Sam's natural selection theory that blonds always get preferential treatment. Bowling decides it. Losers get mohawks. Sugar falls for an Asian exchange student. Lily fails to save a lobster.

Lily and Carmen become Nicole and Mary Cherry's servants in hopes of receiving wigs to cover their mohawks. Sam and Brooke plan to stop their parents' wedding. Mary Cherry opposes her mom's decision to marry "CHiPs" actor Erik Estrada.

Sam runs away from home to track down Brooke's biological mother hoping that the woman will come back and help put an end to the wedding. Mary Cherry sets out to get back at her mother, while Josh, Harrison, Sugar and Emory try to get into a strip club.

The gang investigates the suspicious death of Ms. Glass in this season finale that parodies TV tropes that season finales often use such as murder, musical numbers, gore, nudity, teen pregnancy, terminal illness, wedding, earthquake, etc.

Brooke bonds with her long lost mother, much to her dad's objection as it causes tension between him and Jane. Meanwhile, Lily and Sugar try to save the forever tree from being cut down. While Sam tries to fix the mess she caused that results in a startling revelation.

Ms. Glass equip her students with electronic baby dolls that require maternal care in an attempt to teach them about "the burden of parenting." Meanwhile Sam tries to convince Brooke not to leave, pulling out every trick at her disposal to do so. Emory's wicked twin sisters hold a party and try to outdo Nicole and Mary Cherry.

Carmen runs away from home and moves in with Sam. Jane finds out she's pregnant. Brooke bonds with her new teacher, but she gets her in trouble. Ms. Glass wants to deceive her rich Aussie uncle, so she hires Nicole to play her daughter.

A new arrival threatens Josh's place on the football team; Sam interviews the top jock for an expose; Nicole tries to get back on the cheerleading team.

Nicole decides to get some revenge on Mary Cherry, using Harrison to do it. While she and Mary Cherry try to persuade Brooke to dump Josh and start dating George, in hopes that the new coupling will save's Brooke's plummeting popularity, and thus save their own as well.

Brooke withdraws from the homecoming queen race, whose nominees include a shocked Sam, Carmen, Mary and Nicole. Brooke instead joins the race for student council president. The death of a student leads to mandatory drug testing.

Josh must attend the autopsy of a drunk driver. Sam confronts Harrison over his prescription drug abuse only to learn that he might be dying. Ms. Glass takes on Nicole's team in the homecoming race. Carmen reconnects with her mom.

Harrison goes to a clinic for cancer treatment and gets an annoying roommate. Brooke and Sugar go to the same clinic for their eating disorders. Mary Cherry locks Sam in the Novak and forces her to write her memoirs. Carmen tries to help.

Josh and Lily get cast for a play at the school where they have to appear nude in front of each other and everyone, which makes them uncomfortable. Brooke is at hospital again for treatment for her anorexia. Harrison is frightened when he walks into a room in the hospital and finds a ghost who seems to know a lot about him. Meanwhile, Carmen runs into Nicole in a meeting for teenagers with alcoholic parents, but Nicole totally ignores her.

Harrison's roommate Clarence passes away sending Harrison into a depression that leads to a suicide attempt and a glimpse of what life would have been like if he had never been born.

Ms. Glass gives a lecture on STDs and prepares a Cabaret-type musical on the subject. The students are to play the STDs. Sam wants to lose her virginity with George but he's not ready. Sugar and Josh hire a cool prostitute for Harrison.

Nicole learns she's adopted and tries to track down her real mother. Sugar's hurt because Josh mostly hangs out with Lily now, so George befriends him. Harrison turns into a bad boy. The girls fear he's possessed and organize an exorcism.

Mary Cherry is forced to wear "hobo sheik" clothing and hunt for food in a dumpster after her mother has financial troubles having her wardrobe seized. While Sam and Carmen have the challenge of saving their yearbook.

News of April Tuna's sudden death make everyone face their prejudices about her and finally appreciate her. Josh is inducted into the secret Mullet Society. Sam learns that Harrison loves her. The new lunch lady may be Nicole's birth mom.

Brooke and Carmen are invited under false pretenses to a predatory college party. Josh, George and Harrison try to get in uninvited. Nicole's biological mom isn't what she seems. Sam and Lily have a fun family evening with Jane and Mike.

Lily starts a gay and lesbian club to stamp out homophobia at Kennedy High, but her brave efforts are rewarded with a trip to the hospital.

Nicole stages a coup to overthrow the Glamazons and seize power; Brooke and Sam chafe under a dictatorship at home after one of them stays out all night.

Josh is anxious to prove himself on an academic game show hosted by Ed McMahon; Carmen swings with her sexy dance teacher instead of studying for the SATs.

A killer stalks the students of Kennedy High, persecuting them because of something that happened over spring break.

Josh must choose between his parents' wishes and Lily. She proposes marriage. Sam and Brooke agree to make Harrison pay for the way he treated them. It backfires. The biggest girl in school challenges terrified Mary Cherry to a fight.

Sam and Brooke deliver their baby sister. Ms. Glass rents her basement to Josh and Lily, who try to face life's hardships together. Nicole tries to seduce George. Sam and Brooke make Harrison choose. The show ends on a huge cliffhanger.