Kraken (Unnatural History)

The Kraken is a species that originated from a higher dimensions and is big enough to flatten San Francisco. It can be found floating in the void where it twists itself through almost incomprehensible space. It is known to feed on exotic matter, plumes of raw cosmological power, as well as fountains of energy from the upper reaches which are undetectable in normal space. (EDA: Unnatural History)

The Kraken are one of the predators in the vortex, along with the Chronovores and the Swimmers. (EDA: The Shadows of Avalon)

In Earth mythology, the Kraken was an enormous octopus or squid. The Doctor claimed to have once encountered this creature and sent it back to it's home planet. (DWA: Rough Waters)