6/6 Ian attempts to derail the Daleks' plan by sabotaging their bomb.
5/6 Barbara works in the mine. It transpires that the Daleks plan to fly Earth through space.
4/6 The Doctor, Barbara and Susan make their way to the Daleks' mine in Bedfordshire.
3/6 The rebel attack on the Dalek flying saucer has failed and London is crawling with Daleks.