When Mary and Lester go to parent's night a Brenda's school, Mary does not like the playfulness of her history teacher, or the fact that he does not give tests or homework. She asks the principal to monitor his class, but the principal fires him. When Brenda finds out that Mary was the ""loud-mouth"" parent that squealed, she is mad at Mary, but also feels sorry for Dylan, who she says is a good teacher. Meanwhile, Sandra is a sales representative for Luscious Lingerie, and when her door-to-door sales are not profitable, she asks Mary if she can host a lingerie party at her apt. Mary agrees, but only if Dylan can assist her, to make some money for himself. The party is successful, but Dylan says his heart is with teaching. When she finds out that Brenda and Calvin remember what Dylan's teaching them, she talks to the principal to get his job back. Dylan winds up moving into 227. (thetvdb.com)