Cthalctose
From Tardis Wiki, the free Doctor Who reference
The Cthalctose were creatures that lived within a crystal sea on a planet designated 16 Alpha Leonis One. They were an extremely long lived species, for instance a piece of performance art could last up to 300 years. At some point in their history Earth's moon was their moon. Within it they placed a bio-forming device called Genesis of Cthalctose that, when activated would planet-form the targeted planet to become like their homeworld (the process was often incorrectly termed as 'terraforming). (NA: Eternity Weeps)
