A long time ago, the Roman legion of the ninth vanished into the mists of Scotland. Bill has a theory about what happened, and the Doctor has a time machine. But when they arrive in ancient Aberdeenshire, what they find is a far greater threat than any army. In a cairn, on a hillside, is a doorway leading to the end of the world.
Episode rating
Cast of episode
51
16
2
1
- Bill
- Missy
- The Doctor
- Nardole
- Kar
- Ban
- Lucius
- Simon
- Thracius
- Vitus
- Cornelius
- Marcus
- Judy
- Brother
- Student