A popular teacher has Alzheimer's

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Arvid goes out with an easy girl

Fed up with Dennis' constant gags, Charlie shows him the door - to a remedial-history class, where Denn becomes the inspirational leader for an acade meet the IHP kids.

The IHP class graduates, with T.J. as valedictorian. (Part 2 of 2, and series finale)

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.

Dennis gets a job as a waiter to help pay off debts.

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.

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Charlie moonlights as a character in late night commercials for an appliance store.

Janice says there is a poltergeist following her and soon the class begins to believe her.

The IHP's parent's come to see how the class is taught

Dennis becomes smitten with a quick-witted student who reprimands him for not cleaning his science-lab work area.

The class puts on Grease

Arvid's Dad teaches the honor's math class.

The staff, including Charlie, go on strike

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.

When Dr. Samuels is ejected from the meets, he gets Mr. Moore to take his place as coach.

The class takes a standardized personality test and then worry about the results.

The girls don't like their gym teacher, but she likes Charlie

The spirit of "Hair" leads the cast to go on with the show in defiance of Mrs. Hartman, who explains her objection to Charlie.

Charlie and Arvid reflect on their love woes at a Woody Allen marathon going on at a movie theater.

Dennis sees a bleak future