Ocranhos

The Ocranhos were a race of lifeforms that fed on temporal energy.

Biology
An aquatic race of insectoid humanoids, the Ocranhos had a collective consciousness. The Ocranhos could feed on temporal energy using a removable organ in their jaws that resembled a steel ball.

The Ocranhos were originally led by a mind called the "Great Mind", however, after then destruction of their home system a group of Ocranhos were led by the creator of the "hive", the Matriarch.

History
After evolving, the Ocranhos managed to wipe out every other race in their star system. Fearing that they could destroy every race in the universe, the Time Lords destroyed the Ocranhos' home system, however, one Ocranhos managed to escape its home system and found itself on a nearby planet - designated Hope 332 by the Rimworld Alliance.

Many years later, a Rimworld Alliance ship - the Remembrance of Dreams - arrived on Hope 332 and was attacked by the Ocranhos - who intended to feed on the crew of the ship. This was stopped by the First Doctor and Susan, who evacuated the ship and used it to destroy the last Ocranhos hive - wiping out the species. (A World of Water)