Season 1: Episode 10: Beauty and the Screech
In order to go to the George Michael concert (that's right, we said George Michael), Kelly has to pass her science test. Zack sees a scam that offers him not only Kelly but a ticket to the concert as well. Zack convinces Screech to tutor Kelly in hopes that Kelly will pass the test and then ask Zack to the concert out of gratitude. All goes well until Kelly and Screech end up getting closer than he expected.