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"Something's certainly entered the city, Giuliano. Some malevolent power quite beyond the understanding of that old fraud Hieronymous. The question is, why?"
The Doctor and Sarah Jane land in Italy, only to discover that a wave of evil Mandragora energy has hitched a ride on the TARDIS and is now being used to plunge mankind back into the dark age. They have to thwart not only the murderous count, but also prevent the mad astronomer Heironymous and the Cult of Demnos from unleashing the Mandragora Helix on mankind.
The Doctor: Tom Baker
Sarah Jane Smith: Elisabeth Sladen
Count Federico: John Laurimore
Hieronymous: Norman Jones
Captain Rossini: Antony Carrick
Giuliano: Gareth Armstrong
Marco: Tim Piggott-Smith
Producer: Philip Hinchcliffe
Director: Rodney Bennett
Scriptwriter: Louis Marks