Phabedes

The planet Phabedes was known for its stable climate and weather patterns held in check by its six moons. The Moons however served another purpose that was hidden in legend. The moons were a puzzle. The moons when positioned in the right alignment opened up a gateway to a world within the planet. The creatures from the inside of the planet were large ferocious reptillion creatures, with incredible strength. They had webbed feet, red eyes, sharp razor-like teeth and their scaly bodies dotted with purple spots. Those that lived on the surface by contrast were small, thin, blue-skinned and humanoid in appearance with purple hair.

When the solution to the puzzle of the alignment of the moons was forgetten and terrible storms were unleased on the planet below due to the disruption of the moons, the Eleventh Doctor provided the solution drawn on a paper dart. (COMIC: Eye of the Storm)