In the episode "Reckoner", Lawrence Pressman guest-starred as Boyd Schuller, a terminally ill court judge who hires Tony Mecacci to commit a series of vigilante murders.

In the episode "Cradle to Grave", Mae Whitman and Hallee Hirsh guest-starred as Julie and Carol, two women who are abducted by a married couple, who are unable to have children due to the wife dying from breast cancer.

In the episode "The Uncanny Valley", Jonathan Frakes guest-starred as Dr. Arthur Malcolm, a pedophile who molested his daughter, Samantha, and gave her porcelain dolls away to another girl.

In the episode "Risky Business", John Pyper-Ferguson guest-starred as Wilson Summers, a father who created a viral internet game that convinces young teenagers to commit suicide.

In the episode "Mosley Lane", Bud Cort and Beth Grant guest-starred as Roger and Anita Roycewood, a married couple who abduct children and cremate their remains after sedating them.

In the episode "A Rite of Passage", Mike Doyle guest-starred as Deputy Ronald Boyd, a serial killer who is targeting illegal immigrants trying to cross the U.S. border.

In the episode "A Thousand Words", Jolene Andersen guest-starred as Juliet Monroe, a pregnant widow who has been abducting women for several years until she dies giving birth to her son.

Eric Ladin guest-starred as Joshua Beardsley, a man who seeks vengeance against Porter for murdering his mother Carol, played by Dale Dickey.