• falls exactly on a Doctor Who episode
• falls during the Classic era's season 14
• features the 4th Doctor (Tom Baker, 1974-81)

The inimitable Doctor and his assistant Leela are confronted by sinister and inexplicable occurrences in this gripping thriller set in the shadowy depths of nineteenth century London. With the help of Professor Litefoot, the Doctor investigates the gruesome murder of a cabbie and the mysterious disappearances of young girls. Whilst being chased by giant rats and forced to pit his wits against an evil doll and a merciless illusionist, he comes face to face with his most deadly enemy to date: Magnus Greel, a fifty-first century war criminal posing as Weng Chiang, an ancient Chinese god.

Writer: Robert Holmes (and Robert Banks Stewart)
Director: David Maloney

More information at Wikipedia.