The Master reveals to the trapped Adric that he has a further trap set for the Doctor. Tegan searches the TARDIS computer systems and finds a place named the Dwellings of Simplicity on Castrovalva which will be a suitable place for the Doctor to recover from his regeneration, but when they arrive the Doctor vanishes!
Nyssa and Tegan follow the trail of blood away from the Cabinet, trying to find the Doctor while avoiding the feathered warriors in the forest. They eventually spot the Doctor some distance away, but although they call out to him he doesn't recognize his own name. The warriors take the Doctor into Castrovalva with them, but Nyssa and Tegan arrive seconds too late.
Realising the true nature of Castrovalva's reality, The Master, seeing all is lost, flees to his TARDIS. The Doctor and his companions flee from the city, but who will survive as the city collapses in on itself...
The Cybermen are released from their silos and are on the march, attacking Briggs's crew and ensuring that the freighter remains on course for Earth. But why?
With her crew slowly vanishing, Briggs assumes the Doctor to be the guilty party.
