Transported to a parallel world, the Doctor discovers that England is under military rule and the drilling project is at a more advanced stage.
See all episodes from Doctor Who
See all clips from Episode 3
See all broadcasts of Episode 3 (1)
A seasonal selection of videos, quizzes and festive treats… One unlocked every day!
Give it a go now!
Rebuild, rewire and recode your own Dalek in the new desktop game!
See the behind-the-scenes videos, interviews, clips and other goodies!
See all galleries from Episode 3
Sign in to the BBC, or Register