18. Forget Me Not

Lois checks into a clinic for people with memory loss to help her gain her memories back. She remembers who she is but nothing around her work and what is her relationship with Clark. Her doctor, Dr. Maxwell Deter ( Larry Poindexter ), falls in love with her and tells Clark that he should not tell Lois about them being a couple because it will shock her. In order to get them even more apart, Deter forbids Clark even visiting Lois while he comes closer to her. Meanwhile, another doctor in the clinic, Dr. Elias Mendenhall ( Charles Cioffi ), brainwashes the patients of the clinic to commit murders by using a machine that shows them pictures of the intended target and words like Kill on repeat and the phrase "Save yourself, Kill (name of intended victim)" as well as playing them " Battle Hymn of the Republic " which becomes their call to arms and then kills them by causing them to suffer a stroke.

Clark investigates the murders and with the help of Lois, they manage to find out that Mendenhall is behind everything and stop him before Lois kills Perry as she was brainwashed to do. Mendenhall is arrested and the senior citizens are safe. Lois starts remembering things but not her relationship with Clark and she believes she is in love with Deter.