A high school substitute teacher takes over a class of geniuses.
The class imagines life 20 years in the future
Dennis misquotes Mr. Moore for the school newspaper
Charlie receives a love note from a secret admirer he suspects is in the IHP.
Janice feels left out in class and decides to throw a party to make friends. Charlie dates a model.
Charlie is upset when the IHP's regular teacher announces his return from sick leave.
Arvid tries to impress a girl by challenging the school basketball players to a volleyball match against the IHP class.
Charlie tries his hand at ""Hamlet""
Mr. Moore spends Thanksgiving with Dr. Samuels
After their team project wins them a trip to Washington, D.C., Sarah and Arvid develop slight feelings for each other. But things aren't necessarily a bed of roses between them.
Charlie's ex-flame evaluates the class
When doing reports on their ancestry, both Alan and Darlene find things out that they don't want to.
Eric makes trouble for another teacher
Simone receives a discouraging letter from her favorite poet....after his death. Dennis tries to give up sarcasm and pranks.
Charlie must pass a test in Macro Economics in order to keep his teaching license. The IHP attempt to help him.
Maria dates the captain of the opposing team
The IHP faces their Russian counterparts in an academic tournament. Eric must join the team to replace an ailing Jawaharal.
The class has problems on Valentine's day.
The class makes a music video for a time capsule
Charlie sets Arvid up with a job at a hot nightclub, which causes Arvid to develop a cocky, image-conscious attitude.
Charlie investigates when Sarah's grades plummet.
Arvid starts to daydream about Lori and it affects his schoolwork
Sarah, Arvid, and Dennis compete and deceive to win the science fair.
Charlie encourages the class to revitalize the school's literary journal, and the class votes Simone as editor-in-chief. Unfortunately, the power this position gives Simone slightly goes to her head. Meanwhile, Eric fabricates a memoir for the journal, which dishonestly wins him more attention from Simone.
The IHP are concerned when they learn a transfer student might join their class, making it necessary for one of them to leave. They fight over who it should be.
Dennis holds a sit-in for better cafeteria food after Charlie teaches a lesson on the rebelliousness of the '60s.
The class puts out a lampoon issuse of the school newspaper
When Dr. Samuels is ejected from the meets, he gets Mr. Moore to take his place as coach.
The class puts on Grease
Janice says there is a poltergeist following her and soon the class begins to believe her.
The class takes a standardized personality test and then worry about the results.
Dennis represents the school on a talk show.
Charlie and Arvid reflect on their love woes at a Woody Allen marathon going on at a movie theater.
Arvid sends his penpal Eric's picture
Darlene and Sarah buy a car; problems with Mrs. Samuels has Dr. Samuels rooming with Charlie.
Eric thinks Maria is obsessed with him.
Janice tries to get first chair in the school orchestra
The IHP's parent's come to see how the class is taught
Darlene pretends to like Alan to win debates
Ms. Meara teaches a class on marriage
A popular teacher has Alzheimer's
The class gets matched up with computer dates
Dennis sees a bleak future
Charlie thinks he sees his dead uncle
Dennis gets to play on the football team.
Charlie announces a trip to the Soviet Union.
In Moscow, Dr. Samuels insists on study for an academic meet, while Charlie lobbies for more personal cultural experiences. (Part 1 of 2)
The team begins the competition without Eric, Arvid or Dennis.
The class become peer counselors.
Arvid's dad substitute teaches the honors math class.
Dennis gets a job as a waiter to help pay off debts.
Alan and Sarah both want to be class president.
Eric and Simone go on their first date.
Maria hides her intelligence from a hunk she is dating.
Arvid goes out with an easy girl.
An accomplished journalist alumnus visits.
The final days before opening night are fraught with chaos: no Ronette, Mr. Mushnik MIA, one lead with laryngitis and another ready to walk just before curtain time.
The girls don't like their gym teacher, but she likes Charlie.
Charlie's efforts to broaden the audience and membership of the school's radio club tune out the original fans--and its only member.
Janice takes Dennis to small claims court for a ruined blouse; Charlie falls for Dr. Samuel's sister.
The chess team coach's fervor distracts Arvid.
Charlie moonlights as a character in late night commercials for an appliance store.
Dennis's antics demote him to a remedial class.
The staff, including Charlie, go on strike
Hall monitor Arvid has daytime nightmares of a personal high noon after a bully he cited for loitering demands a showdown - at high noon.
It's the first day back at School and there are some new additions to Mr. Moore's class. Maria, transferred to the High Of Perfoming Arts, Jawarlahal's family moved to California, and Janice went Harvard. The new kids are coming in, Alex Torres, Aristotle McKenzie, and Viki Armory, who has crushes on her teachers.
Eric goes out with Viki and Simone goes out with Alex and they all end up at the art museum.
Certain members of the class suspect Alex of stealing Darlene's antique ring.
Viki believes she is in love with Mr. Moore, but Alan believes she loves him.
Dennis falls for a girl, then later finds out that she is homeless.
Arvid and Dennis's science project makes it into the NASA finals in Houston. (Part 1 of 2)
Arvid replaces T.J. as Alex's dance partner.
Charlie teaches the class about grief.
Arvid considers having his nose surgically repaired to stop his snoring and to look better
T.J. makes a deal with the devil to get accepted into the IHP class.
The IHP students help the school's star athlete prepare for his college entrance exams.
T.J.'s first assignment as the newest member of IHP is ridiculed by Dennis.
Viki gets Eric to design and sew clothes for her home economics project.
Charlie advises Arvid not to mislead a girl.
Alan thinks he is getting early admission to Harvard. When he finds out he won't be getting that, he tries to apologize for remarks he said.
The prudish head of the school's English department seems determined to ruin Charlie's class production of ""Hair"". (Part 1 of 2)
The spirit of ""Hair"" leads the class to go on with the show in defiance of Mrs Hartman. (Part 2 of 2)
The class worries about college recruiters
A new student rejects the Academic Olympics.
Simone agrees to date Dennis after he saves her from drowning.
Arvid takes three girls to the same dance.
Alan falls for a model.
Aristotle tries to help Charlie's acting career.
Aristotle videotapes a mob family wedding.
Charlie and Eric vie for a night-school teacher.
Charlie doesn't return for the new school year and the Kids are wondering where's Charlie? Charlie found an acting gig and left and now the students have a new teacher, Billy MacGregor.
When Alan is caught cheating, Billy has the class act as a jury to decide his punishment.
Arvid goes out with gorgeous Viki.
Arvid's infectious flu may keep the class from performing in a Shakespeare competition.
Billy tries the personals ads.
Inspired by his French class, Eric goes to ""find himself"" in Paris.
Billy fakes a heart attack to circumvent a health-insurance bureaucrasy; the IHP girls try writing a romance novel.
After Billy is robbe, he has the class write papers on gun control, leading Arvid to a harrowing experience when he buys a gun for the assignment. (Part 1 of 2)
Bully Zach may have Arvid's missing gun. (Part 2 of 2)
The IHP class behaves obnoxiously when their bus breaks down at a rural truck stop.
Jasper's overprotective parents hire a babysitter for him -- and to his mortification, it turns out to be Sarah.
Billy and Bernadette take dance lessons at the studio where Alex teaches, and where he's pursued by a woman.
Arvid trains a chimp at his part-time pet store job and, rather than let it be sold, hides it in the classroom.
Simone's reputation suffers when Alex lies to his friends about a romance with her.
At Christmas, Billy helps Viki find her birth mother, but the woman doesn't want to see her.
T.J. turns down Aristotle's invitation to the senior prom.
The kids work on their yearbook, with Eric beginning to regret not having participated more extracurricularly.
To save Dennis after a prank, Billy creates a fictional student -- who apparently gets the MIT scholarship Dennis wanted.
Darlene promises to treat the class to an elaborate farewell dinner, but then finds her credit card revoked.
The class learns T.J. is more than just a contemporary-style musician when Billy discovers her operatic talent.
With a wrecking ball ready to demolish the school, the IHP class waits to fund out who's to be valedictorian. (Part 1 of 2)
The IHP class graduates, with T.J. as valedictorian. (Part 2 of 2, and series finale)