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?
Timings (where shown) are from the start of the programme in hours and minutes
|The Doctor||Peter Capaldi|
|Executive Producer||Brian Minchin|
|Executive Producer||Steven Moffat|