Celebrate Halloween with a suspenseful new episode of Grimm at 9/8c, followed by an all-new Constantine at 10/9c on NBC. Check out the previews below.

Evil Is All Around Us (Preview) – Nick, Hank and Trubel face their biggest challenges yet on the new season of Grimm, Fridays 9/8c on NBC.

Agent Chavez Questions Nick (Preview) – To get to the truth, Agent Chavez reveals she’s Wesen.

Searching for an Answer (Preview) – Monroe and Rosalee look for a way to get Nick’s powers back.