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