The Keeper of Traken

While taking in some of the sights of N-Space, the TARDIS is infiltrated by a powerful being from the planet Traken, known as the Keeper, who asks for the Doctor's help. And though the Doctor is quick to offer his assistance, the Keeper warns of great danger, an unimaginable threat that could destroy the Doctor and his companion. After arriving on Traken, the Doctor and Adric are framed for murder and sentenced to death. As they try to clear their names, a sinister foe lurks in the shadows. Spoiler alert: that sinister foe turns out to be the Master. Last seen in The Deadly Assassin, the Master tries to steal the Keeper's powers in order to secure a new body for himself. Though fairly average overall, The Keeper of Traken is notable for introducing the character Nyssa, who would go on to become one of the Doctor's companions.

 

Rating: Don't listen to me. I never do%