When Ms. Simpson injures her back, a substitute teacher named Tony Crane takes over her class at Bayside when all the girls fall for Mr. Crane, Zack and Slater become jealous.
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Slater's (Mario Lopez) pet dies while in Zack's (Mark-Paul Gosselaar) care.
Zack (Mark-Paul Gosselaar) decides to throw a surprise birthday party for Screech (Dustin Diamond) in the principal's office.
Screech's (Dustin Diamond) alien disguise is so believable it attracts a government UFO investigator.
The pranks between rival schools Bayside and Valley escalate during the week of the city cheerleading finals.
Zack's (Mark-Paul Gosselaar) schemes to get Kelly (Tiffani-Amber Thiessen) to be his girl land him in detention with a rival for her affections.
Zack's use of a subliminal tape to get Kelly to fall for him has results he never intended.
Zack's use of a subliminal tape to get Kelly to fall for him has results he never intended.
Jessie and Zack (Elizabeth Berkley, Mark-Paul Gosselaar) run for student president, each for different reasons.
Everyone is put into pairs for a class assignment to act out married life, so they can be prepared for marriage as adults.
Zack and his friends form a company selling friendship bracelets for a business class project. He names himself as boss, but Kelly, Jessie, and Slater feel he is treating them poorly.
In order for Kelly to go to a George Michael concert, she has to pass her science test. Zack persuades Screech to tutor Kelly, a ploy which is more for his benefit than for Kelly's.
Zack bets against a Valley wrestler named Marvin Niedick that Slater will win his wrestling match against Niedick things go wrong when Slater decides to quit wrestling.
When Kelly is nominated as homecoming queen, her dream is shattered as she faces the prospect of winning after she gets a zit Zack comes up with a solution, but it does not unfold as he plans.
When Ms. Simpson injures her back, a substitute teacher named Tony Crane takes over her class at Bayside when all the girls fall for Mr. Crane, Zack and Slater become jealous.
Zack's (Mark-Paul Gosselaar) plan to get rid of Slater (Mario Lopez) backfires Slater's revenge ends up benefiting Screech (Dustin Diamond).
Zack (Mark-Paul Gosselaar) gets into unusual circumstances and clothes when he tries to help Screech (Dustin Diamond) get a date.
Zack tries to cash in on a stock-market investment to get money to replace his father's video recorder.
Zack promises to help Screech get a date with Lisa if Screech will do Zack's term paper.
Zack's summer romance with an older woman comes to a halt when she discovers he lied to her.
Lisa (guest star Lark Voorhies) visits California University for Kelly's wedding shower. With Tiffani-Amber Thiessen.
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