Terrapratch

Terrapratch’s were large giant turtles that moved in space and were capable of sustaining life in the breathable atmosphere that surrounded its shell. The Doctor, Amy Pond and Rory Williams encountered a race of creatures that had unknowingly been living a parasitic existence dependent on the extraction of a fatty white substance from below the surface for construction and food. As the parasites took more the host Terrapratch became weaker and weaker and endured increasing amounts of pain resulting in disruptive and frightening earthquakes believed to be the work of Sky Goblins. The Doctor was able to encourage a happier co-existence with the use of photographs taken from the TARDIS whilst in hover mode above their worlds, (DWA: The Parasites)