Groske

The Groske were humanoid creatures related to the Graske, but hated them.

Biology
The Groske were almost identical to the Graske. They were small compared to Humans, had three tentacle-like features on their heads and spoke in the same voice. However, unlike the Graske, they had dark blue skin. The Groske were able to smell artron energy. (SJA: Death of the Doctor)

History
At least three Groske were stranded on Earth in 2006, they were found by UNIT and were recruited by them. In late 2010, they worked in UNIT Base 5 helping out with UNIT and the Shansheeth's funeral for the Doctor.

One Groske knew about the Doctor coming and told Clyde that he smelt like time because he had Artron energy. The Groske said the same thing later on before disappearing into a vent, causing Clyde, Rani and Santiago to discover the Shansheeth's plans. The same Groske then helped them to escape from the Shansheeth though an air vent, and brought them to his "den". (SJA: Death of the Doctor)