DESPITE AN OFFICIAL POLICY OF NON-INTERVENTION in the affairs of others, the Time Lords secretly ran black ops missions in order to safeguard their interests – often using the Doctor as their agent.
When the Master stole their file on the Doomsday Weapon – a device capable of making stars go supernova – the Time Lords restored the exiled Third Doctor’s freedom long enough for him to travel to the planet Uxarieus and foil his arch-enemy’s plan (Colony in Space). Later, they dispatched him to the planet Peladon, where he helped broker a deal at a galactic peace conference (The Curse of Peladon) and used him to deliver important information to Ky, a young freedom fighter from the planet Solos (The Mutants).