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The Groske were humanoid creatures related to the Graske, But hated them.
Biology
The Groske were almost identical to the Graske, they too were small compared to Humans and had three tentacle-like features on their heads. However, unlike the Graske, they had dark blue skin. (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 4 helping out with UNIT and the Shansheeth's funeral for the Doctor.
A Groske knew about the Doctor coming and told Clyde that he smelt like time because he had Artron energy
Artron energy had a connection with, apparently, both life force and with time travel. Those who travelled through the Time Vortex would absorb artron energy in the form of a "background radiation." Some life forms were even made of living artron energy.
"Artron energy. Residue of TARDIS engines. Known to be highly inimical to certain time-sensitive life forms."