Written by Rona Munro
"You understand the universe, you see it and you grasp it, but you've never learned to hear the music."
| Episode Title | Premiere Date |
| The Eaters of Light | 17/06/2017 |
A hunt for the lost Ninth Roman Legion leads the Doctor, Bill and Nardole into the middle of an ancient battle that could cast humanity into the dark forever. What is inside the cairn? And how far will they have to go defeat the terrifying alien Eaters of Light?
| Character | Cast |
| The Doctor | Peter Capaldi |
| Bill | Pearl Mackie |
| Nardole | Matt Lucas |
| Missy | Michelle Gomez |
| Kar | Rebecca Benson |
| Ban | Daniel Kerr |
| Lucius | Brian Vernel |
| Simon | Rohan Nedd |
| Thracius | Ben Hunter |
| Vitus | Sam Adewunmi |
| Cornelius | Billy Matthews |
| Marcus | Aaron Phagura |
| Judy | Jocelyn Brassington |
| Brother | Lewis McGowan |
| Role | Crew |
| Writer | Rona Munro |
| Director | Charles Palmer |
| Producer | Nikki Wilson |
| Executive Producer | Brian Minchin |
| Executive Producer | Steven Moffat |
