Garth Marenghi's Darkplace (2004)

S1E1 Once Upon a Beginning

Dr. Liz Asher, the new physician at Darkplace, receives a warning from a psychic cat about the sinister presence haunting the halls. When a patient unexpectedly passes away, Dr. Rick Dagless M.D. is called to action, needing to confront and seal a typical-sized hell-mouth hidden beneath Romford. The episode features some light profanity and a man's bare upper body.