The Substitute (Glee)
Sue's program becomes popular with the students' parents. Her job as principal is made permanent, and she fires Will. Will is later visited by Holly who is looking for help. Holly does not think she is doing a good job as a teacher. She thinks this because she caused Mercedes to act the way she did. She tells him that, at first, she took her work seriously. She changed when a student (Lindsay Sims-Lewis) hit her in the face. Because of being hit, she chose to be more laid-back. Terri arrives while they are talking. She gets mad because Holly is there. Will asks Terri to leave. He tells her that their "reunion" was a mistake and he ends their relationship.