Zack loses a bet to Slater and is forced to give up his beloved ham radio. He makes Screech unhook the antenna, and while he's outside he gets struck by lightning. Don't worry, Screech is okay, but he now apparently has psychic powers.
Testeverde's midterm consists of three essay questions. Everyone is freaking out. Jessie, being the academic snob she is, is concerned about getting an A. Lisa is a nervous wreck and eats constantly. You better lay off the chocolate missy, or white dweebs will stop chasing you around. Kelly even decides to cut gym to study. Randy Records would be so disappointed. ("Don't be sorry. Just don't let it happen again.")
If you had a friend who could tell the future, wouldn't you use it to your advantage? Zack makes Screech tell him the three questions on the midterm, and he's so confident that he'll ace the test that he makes a ridiculous bet with Slater. The loser must be the other's slave. (You would think Lisa would take exception to this, but her views on slavery are pretty lax.)
Kelly is all alone with Zack in his room, and studying is the last thing on his mind. I'm pretty sure he's close to getting it in when Lisa and Jessie storm in. Jessie is a professional cockblock (rivaling only Denisha "Bear" Bryant).
Screech's powers are starting to wear off, and he's not so confident about those questions now. It looks like our hero's in trouble, but he always has a plan. He fakes a flood and pretends to be Belding, who cancels all midterms. Belding gives the three questions that Screech saw, and everything goes well until Testeverde shows up. Apparently he's an amateur plumber and wants to help with the crisis. Belding is wise to the plan, and Testeverde gives the real questions.
The grades are in, and everyone did terribly. Kelly gets a C-, Lisa gets a D+, and Jessie flips out over a B. I really don't like her. Screech got an A because he cheated (He studied!), and Zack got an F-. Yeah, it was that bad. So Zack is now Slater's slave, and the first order of business is ordering a pizza. But don't worry, Zack orders it with extra anchovies! Hahahaha!