Written by Joseph Lidster. A story idea considered for the third and fourth episodes of the fourth series. It was based upon the notion of "faces" which people used to be able to see in patterned wallpaper. While redecorating, one of the Bannerman Road gang was to strip some paint off a wall and reveal old wallpaper underneath. Faces would appear on the wallpaper; these would be aliens from another dimension trying to arrive on Earth, literally taking shape in walls and stepping through them. It was noted that this notion could be adapted for patterns in wooden floors and doors.