New teacher Donna Breedlove can't figure out why her students are not paying attention. Fellow teacher John Deerborn surmises the reason: she is so sexy that she is distracting the boys and making the girls jealous.

A pratical joke may have killed a visiting Russian teacher; Mr. Brawley's driver's-education class takes a wild ride.

The bus breaks down during a school ski trip, leaving class and teachers stranded at a deserted hotel; Mark falls victim to a practical joke.