The Behavioral Analysis Unit (BAU) is called to Atlantic City after two women are found dead and posed in public places that represent childhood—a playground carousel and a swing set. The victims are physically well-cared for but have been kept in a drug-induced, conscious coma for months.
The BAU discovers Samantha was the victim of horrific abuse by her father, Dr. Arthur Malcolm. He molested her and other patients, giving her dolls as "gifts" after each assault and using electroshock therapy to repress her memories and keep her silent. [S5E12] The Uncanny Valley
Unlike many of the show's more malicious killers, Samantha is portrayed with immense pathos. The Behavioral Analysis Unit (BAU) is called to
The episode features a notable performance by Jonathan Frakes (of Star Trek fame) as the predatory Dr. Malcolm, and a chillingly moving performance by Jennifer Hasty as Samantha. S5E12 - “The Uncanny Valley” Arthur Malcolm
The title refers to the psychological theory that human-like figures (like dolls or robots) become increasingly unsettling as they look more, but not perfectly, human.