The End of Time Part One

The story features the Tenth Doctor (Tennant), who has been running from a prophecy of his impending demise, as he is drawn into a scheme by his old nemesis, the Master (Simm). The Master brings the human race under his control as part of an elaborate plan to restore the world of his and the Doctor's own people, the Time Lords, from their demise in the Time War referred to in the series. The Doctor is able to avert this, but incurs fatal injuries, and as has happened before, regenerates and becomes a new man with a new personality and physical traits, setting up the show's following series with Matt Smith as the Eleventh Doctor and Steven Moffat as executive producer.