Guardian of the Spring
From Tardis Wiki, the free Doctor Who reference
Guardian of the Spring was a being on Rastana who used Kamelion to possess him. It was a computer made of stone. It controlled the fauna of the planet which is why they attacked the Fifth Doctor and his friends. It didn't want the Doctor to be helaeld but allowed it as his death would attract others to the planet which it didn't want. (AUDIO: Devil in the Mist)
