Season 10, Episode 08 – The Lie of the Land
The world is gripped by a mass delusion and only Bill Potts can see the truth. When even the Doctor is fighting on the wrong side, it’s up to Bill to convince the Time Lord that humanity is in deadly danger. And if she can’t do that, she may just have to kill her best friend.
The Doctor is an alien Time Lord from the planet Gallifrey who travels through all of time and space in his TARDIS. He has a long list of friends and companions who have shared journeys with him. Instead of dying, the Doctor is able to “regenerate” into a new body, taking on a new personality with each regeneration. Twelve actors, plus John Hurt, have played The Doctor thus far.