The Zack Tapes is the episode in which Zack puts subliminal messages onto a music tape for Kelly in order to get her to dump Slater and go to the dance with him instead. Zack gets caught and everyone tries to teach him a lesson in a hilarious way.
From Nurse to Worse is the episode in which Zack asks Kelly to go steady. However, shortly after asking her, he gets a major crush on the new school nurse and changes his mind about going steady. The school nurse and Kelly both teach him lessons in different ways.
