The trailer includes a glimpse of the foes appearing in the new stories, plus Peter Capaldi’s 12th Doctor telling Clara (Jenna Coleman): “I’ve made many mistakes, it’s about time to do something about that.”
The series returns to BBC One on 23 August and will feature appearances by Sanjeev Bhaskar, Michelle Gomez, Frank Skinner, Ben Miller, Tom Riley, Keeley Hawes and Hermione Norris.