Peter Capaldi The Doctor Actor David Bradley The Doctor Actor Mark Gatiss The Captain Actor Pearl Mackie Bill Potts Actor Lily Travers Polly Actor Jared Garfield Ben Actor Nikki Amuka-Bird The Glass Woman Actor Toby Whithouse German Soldier Actor Jodie Whittaker The Doctor Actor Rachel Talalay Director Peter Bennett Producer Steven Moffat Writer, Executive Producer Brian Minchin Executive Producer