As part of his sentence from the Time Lords, the Doctor was forced to begin his exile on earth with a new face. The Third Doctor was confident, bold and brash, but with a soft paternal side, reserved for those he cared about. While exiled, he became allied to the extraterrestrial taskforce UNIT and helped them combat living plastic Autons, Sea Devils and polluted giant green maggots, as well as fellow renegade Time Lord, The Master. Eventually he was allowed to travel again, and on one such trip received a fatal dose of radiation, prompting him to regenerate once again.