S1, E15: The team is helping the Camelot Society try to find King Arthur's grave despite the reluctance of some of the locals. A mysterious accident and the appearance of the Dark Rider, a ghostly rider said to attack thieves and vandals, plague their efforts. Gabe suspects the son of the local Lord Richard Briarcliff, Morgan, and evidence is planted on Morgan to make him look guilty. Judson finds the apparent remains of Arthur.