Griffoth

Griffoth was the home planet of the Graske.

Astronomical Data
As seen from orbit, Griffoth was a purple planet with grey scars which led to the underground. It was inhabited by the dangerous predators, as well as the Graske. The Graske lived in the caverns of Griffoth, hollowing out tunnels which were connected by airlocks with puzzles. These tunnels lead to the stasis chambers of the Graske, where they stored the original copies of their changelings. (DW: Attack of the Graske)

History
After a Graske started stealing Humans from Earth, the Doctor and a companion followed the Graske back to Griffoth. The Doctor's companion was able to sneak into the caverns and was able stop their plans. (DW: Attack of the Graske)

In 2009, Griffoth was stolen by the Daleks and brought to the Medusa Cascade. (REF: The Time Traveller's Almanac) It was returned by the Doctor to its proper place in space and time after the Daleks were thwarted. (DW: The Stolen Earth/ Journey's End)

Behind the Scenes
Griffoth was the first planet apart from Earth seen in the BBC Wales production of Doctor Who.''