YMMV / The X-Files S02 E14 "Die Hand Die Verletzt"

• Complete Monster: Phyllis Paddock is a demon who poses as a substitute teacher after being accidentally summoned; the person who summoned her happened to be an innocent teenager, who she immediately kills upon seeing, tearing out his eyes and ripping his heart out. While the members of a Satanic cult lived in the town, they had grown very lax in their worship of Satan over time. To punish them, Phyllis kills the stepdaughter of the cult leader by forcing her to slit her wrists, kills the leader by having a snake eat him, and then forces the other members to commit suicide.