The school's chemistry teacher Mr Bringleman presents to his class a very difficult test after which his grade book is set on fire and Moe becomes the prime suspect. Meanwhile, the school's drama society is setting up a performance of "Inherit the Wind".
In order to keep Deion off her back, Yvette fakes a relationship with Mo and begins developing actual feelings for him. Meanwhile, Floyd makes Marcus work at his roofing company in order to teach him the value of a college education.
TJ helps Marcus get closer to a girl by writing love letters for him to send to her. She then also asks TJ to write poetry for her to send back to him, leading to TJ falling for her as well. Meanwhile, Yvette teaches Mo cooking.