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
CinemaSerf
Once again, the steering of the TARDIS proves a bit unreliable as the Mandragora Helix lures it to Earth and to the realm of "Duke Giuliano" (Gareth Armstrong) who has only just recently inherited his title and thereby earned the enmity of "Count Federico" (Jon Laurimore). Now we know that when out ...