Jessie returns from her mother's wedding, and is very excited to have a stepbrother. Kelly and Lisa come to her room to help Jessie welcome him, but are immediately put off by his rude and abrasive attitude.
Meanwhile, Zack is desperately trying to come up with a way to get out of school to go to a Mets vs. Dodgers playoff game. He and Slater meet with Jessie, who clearly isn't happy with her new brother, Eric. They finally meet him, and are also put off by his rudeness.
In math Zack sees a possibility to go to the game when he finds out that the next day is a Jewish holiday. He pretends to be Jewish to get out of school, and gets to go to the game. Unfortunately, Screech has taped the game for Eric, and the tape shows that Zack was at the game instead of at school. Eric uses the tape to blackmail him, forcing him to give up his locker, the ball he caught at the game, and also buy him lunch. Since the alternative is getting suspended, Zack agrees.
Jessie has absolutely had it with her brother, and has Slater over, hoping to keep Eric away. As soon as Slater leaves, though, Eric barges in, and reveals that he has taped Jessie's romantic evening and unless she gives up her room, he'll play the tape for the whole school to hear. Slater tries to strong arm Eric into giving up the tape, but it doesn't work, and Eric forces Slater to lend him his car or else Jessie will be humiliated.
Mr. Belding brings Zack and Slater to show them a present he's bought for his wife: a beautiful, red sports car. He wants Slater to install a CD player, and says that Slater will have plenty of time because he's going to be away for a few days. This gives Zack an idea. He gives Lisa tickets to an MC Hammer concert, the only provision being that she has to go on a date with Eric. At first she refuses, but finally agrees since she really wants to see the concert. Now that Eric has the date, Zack and Slater give him the keys to Mr. Belding's car. It turns out that Eric and Lisa really hit it off. After the date, Zack's plan becomes clear: He wants to get a picture of Eric driving Mr. Belding's car, and use it to blackmail him right back. Unfortunately, it's Lisa who actually drives the car back, and when Screech takes the picture, the flash blinds her and she winds up crashing.
To be continued...