Jessie turns to caffeine pills to keep up with her studies and her new singing group, Hot Sundae.

Mr. Belding's brother, Rod, a substitute teacher, arrives at Bayside to take the gang's History class. Rod proves instantly popular, and soon Mr. Belding is dismayed to find that the kids prefer his brother to him.

While putting up the new field goal post, oil is discovered. Soon the entire school is interested in the oil drilling, but Jessie doesn't like the idea.

Jessie's new stepbrother moves in from New York where he has tricks of his own, including blackmailing her friends.

After Lisa and Eric crashes Mr. Belding's car, Zack and the boys must find a way to repair the car before Belding returns; meanwhile Jessie still disapproves of Eric hanging out with Lisa.

After falling asleep before band rehearsal, Zack dreams of the gang's band, Zack Attack, achieving worldwide fame, before succumbing to jealousy and infighting.

Zack, Slater, Screech, Kelly and Jessie are working at the mall for the holidays, where they befriend a homeless man and his daughter.

It's student-teacher week. Mr. Belding and Zack switch places. Kelly is Slater's History teacher, but Slater thinks she's being too serious about it. When she gives the class a test and everyone skips out on it, Zack faces a hard decision: to be their friend or their leader.

On Valentine's Day, the gang reminisce and share memories of love and past romance.

In 2003, the senior class find a video time capsule buried by the gang in 1993 before graduation, and Mr. Belding, still Bayside's principal, watches it with them.