The Doctor discovers the mysterious wall is an illusion. As he and the companions penetrate deeper into the house, they find the aliens. Tegan and Adric are stunned by an android but the Doctor escapes to get reinforcements. He has also discovered the power packs belong to prison shackles. Tegan and Adric are taken into the alien lab and questioned about their origins. The Doctor realizes the villagers encountered earlier are controlled by the aliens. Having discovered an escape pod, he sends Nyssa back to the TARDIS to work on a weapon to destroy the android while the Doctor and Mace return to the house. Meanwhile Adric escapes but the Doctor is capture and about to be beheaded as a plague carrier.
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And where is this Doctor from?
He's never told us. He likes to be mysterious, although he talks a lot about... uh... Guildford. I think that's where he comes from.
You are being a very stupid woman.
That isn't a very original observation.