An alien intelligence hitches a ride onboard the TARDIS to 15th century Italy, where a deranged astrologer attempts to harness its power.
Tom Baker
as The Doctor
Elisabeth Sladen
as Sarah Jane Smith
Jon Laurimore
as Count Federico
Antony Carrick
as Captain Rossini
Gareth Armstrong
as Giuliano
Tim Pigott-Smith
as Marco
Norman Jones
as Hieronymous
Robert James
as High Priest
Brian Ellis
as Brother
Pat Gorman
as Soldier
James Appleby
as Guard
John Clamp
as Guard
