An alien intelligence hitches a ride onboard the TARDIS to 15th century Italy, where a deranged astrologer attempts to harness its power.

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Main Cast: Tom Baker, Elisabeth Sladen, Jon Laurimore, Antony Carrick, Gareth Armstrong, Tim Pigott-Smith, Norman Jones, Robert James, Brian Ellis, Pat Gorman

Director: Rodney Bennett

Writer: Louis Marks

Editor: Clare Douglas

Cinematographer:

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