The BAU continues its search for the serial killer in Canada, and they stumble upon a disturbing find that could expose the killer's motives. Meanwhile, a team member may have become the target of a killer from the past.
- Sharif Atkins - William Hightower
- Jon Barton - SWAT Leader
- Willam Belli - Walter Patterson
- Benjamin Byron Davis - Burt Lang
- Garret Dillahunt - Mason Turner
- Timothy James Driscoll - OPP Officer #1
- Cherrelle E'Lan - Lee Hightower
- Jennifer Floyd - Search and Rescue Medic
- Brian A. Gutierrez - Pigpen CSI Tech
- C. Thomas Howell - George Foyet
- Lily Kershaw - Kelly Shane
- Rowena King - Detective Tay Benning
- John Lacy - Officer Jeff Bedwell
- Scott Lincoln - Motel Clerk
- Krystal Marshall - Vicki
- Gavin McClure - Border Agent #2
- Casey Nelson - Constable Cassar
- Paul Rae - Lucas Turner
- Brandon Taylor - Border Agent #1
- Jessie Usher - Daniel
- Vernee Watson-Johnson - Maxine Hightower
- This episode is currently the second episode in the show's history that doesn't use bookend quotes, the first being the Season Three episode "Doubt."
- However, the episode does end with Hotch saying, "Sometimes there are no words, no clever quotes to neatly sum up what's happened that day. Sometimes you do everything right, everything exactly right and still you feel like you failed. Did it need to end that way? Could something have been done to prevent the tragedy in the first place? 89 murders at the pig farm; the deaths of Lucas and Mason Turner make 91 lives snuffed out. Kelly Shane will go home and try to recover, to reconnect with her family, but she'll never be a child again. William Hightower, who gave his leg for his country, gave the rest of himself to avenge his sister's murder. That makes 93 lives forever altered, not counting family and friends in a small town in Sarnia, Ontario, who thought monsters didn't exist until they learnt they spent their lives with one. And what about my team? How many more times will they be able to look into the abyss? How many more times before they won't ever recover the pieces of themselves this job takes? Like I said, sometimes there are no words, no clever quotes to neatly sum up what's happened that day. Sometimes the day just...ends."
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