Four more actors have been signed up to guest star in the next series of Doctor Who. Comedian Charlie Baker will appear in an episode, and he will be known as "Fat Man". Whilst in the same episode that Baker is in, Sold star Dan Johnston will play the character "Thin Man". Also, Spotlight claims that actresses Fern Duncan and Frances Encell have been cast for Voice Overs. It has also been confirmed that Spooks and Mistresses director will direct an upcoming episode of Doctor Who.