Caskelliac

Caskelliac were a dark, slimy alien race with purplish skin who invaded Orkney, Scotland in 2025.

They wore smokey silver armor studded with controls, their head a lump with no face recognizable in human terms. They had bristly tentacles on their heads and spoke with shrill, high-pitched voices. It was required for their survival that they conquer other races to use them for energy. After harnassing the local power plants to fix all living things to the planet, they drained their life essences for survival. One of the race offered sympathy for the ones they had to destroy for sustenance, but the Eleventh Doctor insisted there could be another way for them to sustain themselves. (AG: The Ring of Steel)