Swimmer (species)
From Tardis Wiki, the free Doctor Who reference
Swimmers were immense transcendental beings which dwelt in the Void between universes. They were so vast that universes burst against their sides like bubbles against a whale. One and the Hermit released the Fendahl Predator to prevent Swimmers from being attracted to the universe. (PROSE: The Taking of Planet 5) They are also known as intercreationals. (PROSE: The Book of the War)
