After the series premiere of Constantine, NBC released a sneak preview of next week's episode, which is called "The Darkness Beneath."
In "The Darkness Beneath," an ancient spirit torments a Pennsylvania mining town, and James Legros guest stars. Deep in the mountains of Western Pennsylvania, John (Matt Ryan) is a small mining community's only defense against an ancient Welsh spirit. In the course of protecting these isolated innocents, John finds a vital new ally in a mysterious young woman named Zed (Angélica Celaya). Harold Perrineau and Charles Halford also star.
"The Darkness Beneath" episode of Constantine airs on Friday, October 31, 2014 at 10 PM ET.