The Claws of Axos standard. The story includes interior scenes inside the TARDIS for the first time in the Pertwee era of the show. The configuration of the TARDIS set-up is unique for this adventure. The TARDIS monitor appears to be a circular screen embedded in one of the 'roundels' in the console room wall, rather than the traditional rectangular screen (this feature is seen again once, a year later, on the unique set built for "The Time Monster"). The doors of the console room do not open directly into the exterior as in all other adventures; instead they open into a corridor that
Home Hill Powerhouse which leads to the first floor. The staircase is constructed of concrete with an iron handrail. The western wing has narrow brickwork columns dividing the facade into three bays. It supports a verandah on the ground and first floors. The ground floor has been partitioned into three rooms: a laboratory, storeroom and galley kitchen. The interior walls are rendered and are painted white. The first floor has been partitioned into two rooms with a timber-framed wall, which were bare of any fixtures and fittings and have a very simple interior. The ground floor of the eastern wing contains the main