The Graske were small compared to humans and had pebbly brown skin and three tentacle-like features on their heads. They had difficulty speaking other languages, using odd grammar and curt sentences. (TV: Whatever Happened to Sarah Jane?, Music of the Spheres) Individuals were physically similar, leading Mr Smith to suggest that the Graske may have been a clone species like the Sontarans. (TV: SJAF 1) They come from the planet Griffoth.(TV: SJAF 1) The Groske were related to the Graske, though blue in colour. (TV: Death of the Doctor)