Sean Persaud

The BAU is called to Oklahoma to investigate a murderous clown who is terrorising a town.

Bobby takes an interest in Travis's photography professor, but Travis refuses to introduce them; Laurie develops feelings for a man she has only spoken to on twitter; Jules and Andy prepare to face off with a group of kids.

Maya's Halloween becomes terrifying when JJ attends a rave in the woods. Jimmy and Kenneth turn the DiMeo home into a haunted house.

Jack reluctantly agrees to search for his daughter Hannah's boyfriend who has disappeared. He was last seen running away from home in Chicago to be with Hannah in New York.

As Meredith (Ari Graynor) uses a class field trip 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.