The Doctor overcomes Mace and Tegan using spare power packs. The Terileptil leaves for his base in the nearby city and sends the android to take control of the TARDIS. The Doctor, Tegan and Mace escape and search the Terileptil's lab to find it completely empty. Mace tells the Doctor that the nearby city the Terileptil was referring to was London. The android arrives at the TARDIS and is successfully dealt with by the sonic booster Nyssa finished. Adric and Nyssa then move the TARDIS to meet the Doctor and the others at the manor.