Coming off a successful trip to 1941 London involving an "Empty Child," the Doctor and Rose (along with newcomer, Captain Jack Harkness) stumble on a mystery within one of the realms of the Infinite DC. Their paths cross with Elvira, the self-proclaimed "Mistress of the Dark" and host of the Movie Macabre, who also happens to be the 24th incarnation of Neas, the Gladiator of Gallifrey and friend/pupil of the Doctor. Together, these two Time Lords resolve an unusual conflict involving humans, bugs, and an old enemy of Elvira's from the Cyber War - the dreaded Cylons.