A vigilante starts killing prostitutes when he feels that his efforts to clean up the city aren't being appreciated. Meanwhile, a young man seeks out Reid to help him understand the murderous urges he has had his whole life and fix them.
- Rhonda Marie Alston - Alleyway Prostitute
- Greg Baglia - Police Officer
- Trishelle Cannatella - Jane
- Thomas Crawford - Ronald Weems
- Janie Haddad - Whistle-Blowing Prostitute
- Emily Brooke Hands - Rhonda
- Mel Harris - Congresswoman Karen Steyer
- Ben Hermes - Uniform Cop
- Ronald Hunter - Detective Victor Barnes
- Burnadean Jones - Mae
- Susie Kantar - Crystal
- Annie LaRussa - Linda Weems
- Katy Magnuson - Holly
- Marco Antonio Martinez - Medic
- JoAnna Rhambo - Prostitute
- Marvin Shapiro - Lawyer
- Jessica Tuck - Doctor Sarah Harris
- Anton Yelchin - Nathan Harris
- "Where Is My Mind?" by The Pixies
- "I Gotta Feeling (Just Nineteen)" by Eagles of Death Metal
- Spencer Reid: T.S. Eliot wrote, "Between the idea and the reality, between the motion and the act, falls the shadow."
- Spencer Reid: T.S. Eliot wrote, "Between the desire and the spasm, between the potency and the existence, between the essence and the descent, falls the shadow. This is the way the world ends."
- Jessica Tuck, the actress who portrayed Doctor Sarah Harris, reappeared as Amy Wheeler in an episode of Suspect Behavior, the short-lived Criminal Minds spin-off.
- Matthew Gray Gubler's sketch of Nathan Harris took the place of the one made by the prop department.