Klytode

The Klytode was an recurring enemy of the Doctor. The Klytode is a gestalt being; one powerful mind with many bodies. Each Klytode shares the thoughts and ambitions of the master creature. Their homeworld, on the edge of the Arktren galaxy, was left a dark husk of matter - a fate of any world that the Klytode inhabit.

In 3769, the Doctor encountered the Kyltode on Space Station Alpha, where he was planning to denote a cobalt bomb onboard the space station, sending it crashing to Earth causing a catastrophic change in the climate in readiness for the arrival of the Klytode brethren. The Doctor foiled his attempt by ejecting the bomb into space and the Klytode was arrested and sent back to the Arktren galaxy. (DWAM: The Snag Finders)

In 4041, the Doctor defeated the Klytode for a second time when he tried to destroy the Earth by releasing toxic bombs around the world's weather control centre using a delegation of androids. When the androids learn that they would be destoyed in this plan, they turned on the Klytode. The Klytode was captured and when he said he would never change his ways until the Earth is destroyed and the Doctor totally humiliated, he was left to be held under lock and key. (DWAM: Return of the Klytode)