Waltenate and his team call upon their counterparts from This Side for help when a serial killer goes on a bloody rampage. However, when they recruit the killer's This Side counterpart, a professor of forensic psychology, the team is forced to consider whether they can put civilians at risk.

Cast: Patrick Wilson, Jennifer Ehle, Margo Martindale, Pablo Schreiber, Rachelle Lefevre, Gbenga Akinnagbe, Aaron Bantum, Taegle Bougere, Cara Buono, Orlagh Cassidy, Rhys Coiro, Brian Delate, Mike Doyle, Raúl Esparza, Marin Ireland