A Robot created on the factory asteroid Xuthia. Drons are manufactured to house various types of artificial intelligence and are powered by an extremely rare, radioactive power source called Ladryon ore, which makes them valuable and highly sought after. They are shipped throughout the galaxy and are essentially used as servants to the rich. The Doctor took a Dron into his tardis as a souvenir and at his first encounter with the Zhth, the Dron became an animated entity when the Zhth entered it.