An unreasonable history teacher makes his students' lives miserable by using an infamous steep grading curve and when Brandon learns that Steve gets A's by stealing exams before the test, he decides to follow suit. Brenda and Kelly vie for Dylan's attention and when he states that he prefers blondes, Brenda grows insecure and decides to dye her hair but the result is horrifying.

Following their disappointing seventeenth wedding anniversary, Cindy feels like the intimacy is lost between her and Jim and engages in an emotional affair with her old college boyfriend who has moved to town, scaring Brenda into thinking her parents are headed for divorce. Meanwhile, Brenda and Brandon participate in a UCLA study on twins. Also, David wants to be the new school DJ.