Carvil

Carvil was a Time Lord who participated in the Last Great Time War. After his plans on the planet Derilobia were unraveled by the Eighth Doctor, he eventually re-emerged as Carvil the Resurrected to become the unlikely new leader of the Clock-People.

During the Last Great Time War
He had a wife and children, but they were killed by the Daleks which caused him to develop a strong hatred of the Daleks. As a result, he manipulated events on the planet Derilobia to create the illusion that the planet had been attacked by the Daleks so that he could turn the entire planet into a weapons manufacturing facility, with his goal being to create vast missiles that would be able to destroy all of the Daleks' ships. Carvil was officially commanded by the Fifth Tamasan, but she maintained a degree of distance from her underlings' efforts to officially allow them to do their jobs as they saw fit. (AUDIO: The Lords of Terror)

Supposed death
The Eighth Doctor discovered Carvil's plan when he took his new companion Bliss to Derilobia, as it was her home planet before Carvil's actions changed history in a manner that suggested Bliss was now never born. After learning what Carvil had done, the Doctor rejected Carvil's protests that it was necessary to go this far to destroy the Daleks. When a Dalek agent was able to make contact with the Daleks, the Time Lords were forced to evacuate with Carvil being left behind as his TARDIS was sacrificed to provide power to all other TARDISes attempting to escape the Daleks' trap. (AUDIO: The Lords of Terror)

On Gallifraxion Four
Carvil reemerged as "Carvil the Resurrected", leader of the Clock-People, (PROSE: Out of the Box) devolved members of Faction Paradox who had survived the end of the War in Heaven, and had the ability to corrupt individuals' timelines to attain physical reality. (PROSE: Anachrophobia, The Story So Far...) Under his leadership, the Clock-People escaped the Void Between Worlds and used their powers on an unprecedented scale, inserting themselves into the entire history of the planet Gallifraxion Four. In this manner, they claimed it as their new homeworld, with Galactic Heritage unable to realise that they were not native to the planet.

At some point, a fragment of the Greth landed on Gallifraxion Four, getting the chance to admire the Clock-People's techniques, which it would later attempt to mimic. The Greth's attempt to take the planet over was a failure. After it was captured, Carvil led the Greth's trial, a joke-trial with a charge of interference. He passed sentence, condemning the Greth to banishment in the Void Between Worlds. This sentence was indeed carried out, although the Greth eventually found a way back into the universe with the help of its "patron", (PROSE: Out of the Box) the Yssgaroth. (PROSE: Preternatural Nights) Making its way to 2019 Earth, the Greth recounted its encounter with the Clock-People and Carvil to Giles's Preternatural Research Bureau during their confrontation. (PROSE: Out of the Box)

Behind the scenes
Out of the Box does not clarify if the resurrected Carvil joined the Clock-People at some point posterior to the events of Anachrophobia, or if it should be understood that he joined Mother Mathara's Faction Paradox splinter and was among the members of her fleet who fell through time following The Ancestor Cell and became the "original" Clock-People.