Martin Baugh designed the Yeti costume; he was also responsible for costumes in their second serial "The Web of Fear". This serial used different Yeti costumes from those of their debut, which were not considered threatening enough and had deteriorated. The Yeti robots that appear in "The Abominable Snowmen" are large with brown fur and a blackened face. These costumes also have clawed hands and feet, and they house control spheres in their chest, used by the Great Intelligence to remotely operate them.