credence when another murder occurs after his arrest. Mostow draws a gargoyle and claims it made him kill. The agents meet with Patterson, who has spent three years working the case. Mulder knows Patterson from his time in the Investigative Support Unit at Quantico. Their relationship is tense, and Patterson is skeptical of Mulder's theories. Mulder and Scully go to Mostow's studio and discover a hidden room full of gargoyle sculptures, finding corpses within them. A glassblower is attacked and hospitalized. Nemhauser (Greg Thirloway), another agent on the case, tells Scully that Patterson was responsible for getting Mulder assigned to the investigation and may admire him after all. Patterson finds Mulder in the library studying gargoyles, expressing disappointment in him. Scully goes to Mulder's apartment and finds it covered with gargoyle drawings. Mulder, having sculpted a gargoyle himself in Mostow's studio before falling asleep, awakens to find a figure with a gargoyle-like face standing over him; he gives chase but is attacked, his face slashed with a utility knife. Mulder refuses to explain to Scully why he was in the studio. Scully confronts Patterson, who tells her not to try and stop Mulder from doing what he's doing, because she won't be able to. Mulder again goes to see Mostow again, who refuses to divulge how to find the creature that attacked him. Scully finds a disassembled utility knife at the latest crime scene with Mulder's prints on it and discovers that the murder weapon is missing from the evidence room. She meets with Assistant Director Walter Skinner (Mitch Pileggi), who is also worried about Mulder's behavior. Mulder has a nightmare about being attacked by a gargoyle that is really himself. He wakes up and goes to Mostow's studio again, finding a severed arm. Scully gets a message to call Nemhauser, but his phone is answered by Mulder, who denies taking the knife. Mulder searches Mostow's studio and finds Nemhauser's body inside a new sculpture. Mulder is then confronted by Patterson, who is unaware of how he arrived at the studio. Mulder then deduces that Patterson is the killer, based on his three-year obsession with Mostow and his request for Mulder to investigate the case. Mulder confronts him, but Patterson flees when Scully arrives. Mulder pursues him and they fight, but Mulder perceives Patterson as a demonic gargoyle creature. Patterson is shot and apprehended. In the last scene, Patterson is