Sean Persaud

The BAU is called to Oklahoma to investigate a murderous clown terrorizing the sleepy town of Guymon.

Bobby takes an interest in Travis's photography professor; Jules and Andy face off with a group of kids. Guest starring Sarah Chalke.

As Meredith (Ari Graynor) uses a class fieldtrip to track down a handsome employee of an Internet company, Principal Carl (David Alan Grier) appoints Ginny (Kristin Davis) to fill in for him while he tags along.

Maya’s Halloween becomes truly terrifying when JJ attends a rave in the woods. Ray joins Dylan’s Halloween heist determined to prove he’s more than a do-gooder. Meanwhile, Jimmy and Kenneth turn the DiMeo home into the neighborhood’s haunted house.

Jack grudgingly agrees to search for his daughter Hannah's (recurring guest star Vanessa Marano) boyfriend who disappears after he runs away from home in Chicago to be with her in New York. Recurring guest star Adam Kaufman appears as Brian Donovan, the father of Samantha's son, Finn.