“Supernatural” (9 p.m., The CW): The guys on “Supernatural” get involved

“Supernatural” (9 p.m., The CW): The guys on “Supernatural” get involved with a witch who is running a high-stakes poker game.

“The Mentalist” (10 p.m., CBS): “The Mentalist” is getting into the Halloween spirit as Jane and the gang investigate the death of a man who witnesses say was killed by a ghost.