Straxus

Straxus was a Time Lord who acted as an agent for the Celestial Intervention Agency and High Council.

Incarnations of Straxus
Straxus once worked for the Celestial Intervention Agency. (AUDIO: The Light at the End) In one incarnation working for the CIA, he attempted to use a time ram to force the Master's TARDIS out of the Time Vortex to erase him from existence, only for to survive and shoot Straxus. (AUDIO: The Threshold)

In another incarnation Straxus oversaw the Time Lord delegation at the Vess weapons factory and was forced to bargain with after the renegade discovered the operation. He reluctantly aided the Sixth Doctor in stopping the Master's scheme to use a conceptual bomb to erase the Doctor's travels. (AUDIO: The Light at the End)

During the War in Heaven, Straxus' future self was stranded on Earth in 1888 after his Time Ring failed during a mission. (AUDIO: The Adventure of the Diogenes Damsel)

In a new incarnation Straxus worked for the High Council. He ordered the Eighth Doctor to Lonsis in 2006 to retrieve Lucie Miller from a temporal blackspot and subsequently discovered the witness protection scheme she'd been a part of had been botched, which Straxus blamed on the CIA. (AUDIO: Human Resources)

Another incarnation of Straxus became aware of the scheme of his future self and the Dalek Time Controller to use retro-genitor particles against the Time Lords and sought to exploit it to erase the Daleks instead. (AUDIO: X and the Daleks) With the agreement of the Lord President, he embroiled the Eighth Doctor, (AUDIO: The Great War) instructing him to look after Molly O'Sullivan. (AUDIO: Fugitives) Straxus was killed by the Time Controller before his plan could succeed, erasing his future self in the process. (AUDIO: X and the Daleks)

In a timeline which was eventually unwritten, Straxus worked with the Daleks and changed his name to Kotris. (AUDIO: The Great War, Fugitives, Tangled Web) He planned to erase the Time Lords but came into conflict with his younger self, eventually resulting in his younger self's premature extermination which erased Kotris from existence. (AUDIO: X and the Daleks)