One of the most popular shows in British TV history, this long-running, shoestring-budgeted sci-fi saga followed the exploits of "the Doctor," a maverick scientist and adventurer who traversed space and time in the TARDIS, a high-tech craft disguised (well, stuck, actually) as a London police box. William Hartnell, Patrick Troughton, Jon Pertwee, Tom Baker, Peter Davison, Colin Baker, and Sylvester McCoy starred as the various eccentric incarnations of the Doctor during the series's initial 1963-1989 run. The Doctor (Tom Baker) and Sarah Jane find themselves in 15th-century Italy, where not only must they prevent the living energy source known as the Mandragora Helix from using an underground cult to conquer the Earth, they'll also have to deal with putting down a planned palace coup.