- You may be looking for Kotris.
At some point after regenerating, though retaining his "supercilious smile", Straxus became Coordinator of the CIA. (AUDIO: The Great War, The Death of Hope) Straxus was instructed by the Lord President of Gallifrey to send the Eighth Doctor to France during World War I to protect Molly O'Sullivan. Finding the Doctor trying to travel to the end of the universe, which Straxus noted was forbidden to Time Lords, he had to talk the emotionally bereft Doctor down. When the Doctor admitted that he was looking for hope, Straxus sold his mission for the Doctor as a chance for him to see some hope. (AUDIO: The Great War)
Fully aware that a later incarnation of his was working with the Daleks against the Time Lords, Straxus travelled to Srangor, where regeneration had been rendered impossible, to kill himself before he had the chance to regenerate. (AUDIO: Fugitives, X and the Daleks) After arriving, Straxus asked a local herder to kill him, and when he refused, Straxus chose to jump off a mountain. However, he was saved by Kotris's drone, and any further attempt to kill himself that he made was prevented by the drone, forcing Straxus to abandon his plan. (AUDIO: Fugitives)
Reporting to the President, Straxus confirmed that Kotris was acting as they expected, and that his temporal drone was following him. However, he noted that the Doctor had disappeared, and the President ordered him to find the Doctor by any means necessary. Predicting what Kotris would do, Straxus and his assistant Sandun managed to rescue the Doctor and Molly from a group of Daleks. Straxus briefed the Doctor on Kotris, revealing him as a genetically altered Time Lord, but not revealing his identity, simply referring to him as X.
His TARDIS was attacked by the Daleks, and he programmed the Doctor's TARDIS with the coordinates to Srangor, seemingly sacrificing himself and his TARDIS. (AUDIO: Tangled Web) However, this was an illusion created for the Doctor's benefit, and he escaped back to Gallifrey. Straxus modified the retro-genitor particles implanted in Molly to target the Daleks instead of the Time Lords, but in a confrontation with Kotris and the Dalek Time Controller, the Time Controller killed him. This meant he could never become Kotris, and the scheme was entirely undone. (AUDIO: X and the Daleks)