When a young boy who mysteriously went missing in San Diego on Halloween suddenly reappears one year later, the BAU must work fast when another trick-or-treater disappears under similar circumstances.
- Anson Bagley - Joshua Parker
- Molly Baker - Jessica Brooks
- Anjali Bhimani - Doctor Rasgotra
- Ephraim Burns - Tyler
- John Henry Cabula - Nolan Alvardo
- Clint Carmichael - Sam Bidwell
- Britain Dalton - Billy Hawkins
- Billy Dec - Detective Paul Rosado
- Braden Fitzgerald - Hunter Olson
- Dillon Fitzgerald - Child at Pumpkin Patch
- Kelly Fitzgerald - Lyla Olson
- Travis Gibson - Jake McCauley
- Josh Harp - Creepy Guy #2
- Terence Bernie Hines - Stanley Holmes
- Michael Hyland - Phil Olson
- Cornelius Jones, Jr. - Desmond (Madam Bouvier)
- Austin Kane - Young John David Bidwell
- Brenda Kate - Mrs. Parker
- Natasha Key - Police Officer
- Abigail Zoe Lewis - Young Sandra Bidwell
- Shannon Lorance - Sandra Bidwell
- Christopher May - Rodney Tanner
- Cade Owens - Jack Hotchner
- Pamela Reed - Mary Bidwell
- Gregg Rogen - Mr. Parker
- Tatiana Szalay - Ann Olson
- J. Michael Trautmann - John David Bidwell
- Phylicia Wissa - Marjorie
- "A Woman's Love Is Never Done" (feat. Connie Russell) by Al Lerner
- "Spooky Kids" by Itch
- "Keep Your American Dream" by Beartooth
- "I Don't Want to Be Alone" by Michael Grimm
- "What Have I Done" by Taps
- Aaron Hotchner: "There is nothing funny about Halloween. This sarcastic festival reflects, rather, an infernal demand for revenge by children on the adult world." — Jean Baudrillard
- Jennifer Jareau: "Always kiss your children good night, even if they're already asleep." — H. Jackson Brown, Jr.
- Though this is the sixth episode of the season, it aired a week before If the Shoe Fits, the prior episode, both episodes being scheduled out-of-order.
- Travis Gibson, who guest-stars as Jake McCauley, is the middle son of Thomas Gibson, who portrays Hotch on the show and is also the director of this episode. Also, Gibson's daughter Agatha plays an uncredited role as the trickster girl the camera follows until it finds McCauley. In addition, his oldest son James shadowed him behind-the-scenes to learn how an episode of a TV series is prepared, directed, and edited.
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