The Doctor then appears through the wall and explains it is a holographic energy barrier. The group walks through and joins the Doctor. Once in the cellar, they notice the place smells of soliton gas. Also in the cellar are caged rats and the device emitting the gas. While the five are searching the room, the figure from before, an android, sneaks up on them. It succeeds in "stunning" Tegan and Adric, while the Doctor, Nyssa and Mace are forced to retreat.