Griffoth

Griffoth was the home planet of the Graske and Groske.

Astronomical data
As seen from orbit, Griffoth was a purple planet with grey scars which led to the underground. It was inhabited by dangerous predators, as well as the Graske. The Graske lived in caverns, hollowing out tunnels which were connected by airlocks with puzzles. These tunnels led 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 Tenth Doctor and a companion followed the Graske back to Griffoth. The Doctor's companion sneaked into the caverns and stopped 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 Tenth 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.