The Tower Is Tall but the Fall Is Short

The group investigate Dr. Boyd Sherman, another of the names written on the wall of their basement by the man from the future. The doctor is a psychologist, and the investigation turns into therapy for John. Not coincidentally, Catherine starts seeing the same therapist to assist with her relationship with Savannah, leading to a larger Skynet interest. A woman from Derek's future appears in the present and Derek tries to learn why.