After receiving a warning from the White Guardian, the Doctor initially believes the TARDIS has landed aboard an Edwardian clipper ship - but all is not as it seems. While the time travellers are caught up in the omnipotent Eternals' race for the ultimate prize, the Black Guardian's scheme to destroy the Doctor enters the end-game - but which side is Turlough a pawn of?

Doctor Who (1963) Season 20 Episodes...

• s20e01 - Arc of Infinity (1)
• s20e02 - Arc of Infinity (2)
• s20e03 - Arc of Infinity (3)
• s20e04 - Arc of Infinity (4)
• s20e05 - Snakedance (1)
• s20e06 - Snakedance (2)
• s20e07 - Snakedance (3)
• s20e08 - Snakedance (4)
• s20e09 - Mawdryn Undead (1)
• s20e10 - Mawdryn Undead (2)
• s20e11 - Mawdryn Undead (3)
• s20e12 - Mawdryn Undead (4)
• s20e13 - Terminus (1)
• s20e14 - Terminus (2)
• s20e15 - Terminus (3)
• s20e16 - Terminus (4)
• s20e17 - Enlightenment (1)
• s20e18 - Enlightenment (2)
• s20e19 - Enlightenment (3)
• s20e20 - Enlightenment (4)
• s20e21 - The King's Demons (1)
• s20e22 - The King's Demons (2)

Doctor Who (1963) Show Summary

Doctor Who is the longest-running science fiction TV series in history, airing initially from 1963 to 1989. Doctor Who is about ideas. It pioneered sophisticated mixed-level storytelling. Its format was the key to its longevity: the Doctor, a mysterious traveller in space and time, travels in his ship, the TARDIS. The TARDIS can take him and his companions anywhere in time and space. Inevitably he finds evil at work wherever he goes...