The
Ood warn the
Tenth Doctor that
the Master has returned, heralding "the end of time". On Earth, a cult resurrects the Master, but his widow Lucy sacrifices herself to sabotage the ceremony. The Master is returned to life with incredible strength, but is plagued by constant hunger and suffers from slow degeneration. The Doctor encounters
Wilfred, who helps track down the Master's location. The Doctor fears a prophecy stating "he will knock four times", which will result in the Doctor's death. He discovers that the drumbeat noise in the Master's head was externally implanted. The Master is taken into the custody of billionaire Joshua Naismith, whom the Doctor recognizes from the Ood's vision. Naismith has recovered a broken Vinvocci medical device and wants the Master to repair it. At Naismith's mansion, the Master reprograms the device to change humanity into six billion clones of himself. Wilf shields himself in a control room to avoid being changed, while his granddaughter Donna also doesn't change due to her biology being rewritten in
Journey's End, but does not remember this due to the Doctor being forced to wipe her memories of him to protect her. The Doctor and Wilfred take refuge from the Masters on the Vinvocci salvage ship. On the last day of the
Time War, faced with the destruction of Gallifrey and the end of his race, Lord President
Rassilon implants the drumbeat in the Master's head as a child in a desperate bid to escape the "Time Lock" in which the
Time Lords are trapped. In the present, the billions of Masters amplify that drumbeat signal. Still needing a contact point, Rassilon launches a
Gallifreyan diamond to Earth. The Master uses it to create a link that brings Gallifrey out of the Time War and into orbit around Earth. Driven mad by the horrors of the Time War, Rassilon plans for the Time Lords to ascend to an incorporeal state while destroying the rest of creation. He stops the Master's plan of implanting himself into the Time Lords by restoring the human race. The Doctor returns to Naismith's mansion armed with Wilfred's gun, taking aim at both the Master and Rassilon with each encouraging the Doctor to kill the other. He tells the Master to move and destroys the diamond, severing the link with Gallifrey. Rassilon, determined to drag the Doctor back to the Time War with him, is stopped by the Master, and both disappear into the rift. Stunned to be alive, the Doctor then hears four knocks. He discovers that Wilfred, who had come to help, is trapped in one of the control rooms of the Vinvocci device that is about to be flooded by radiation. The Doctor saves Wilf by taking his place in the control room and suffers
radiation poisoning, triggering a regeneration. After returning Wilfred home, the Doctor visits his past
companions: he saves Martha and Mickey, now married, from a Sontaran; prevents Luke Smith from being hit by a car and bids farewell to Sarah Jane; connects Jack with former midshipman
Alonso Frame; meets Joan Redfern's great-granddaughter and inquires if she led a happy life; sees Wilf one more time to give him a winning lottery ticket for Donna as a wedding present; and briefly visits Rose the year she is due to first meet the
Ninth Doctor. Ood Sigma appears to the Doctor, telling him the Ood will "sing you to your sleep". On board the
TARDIS, the Doctor, still resisting his imminent
demise, sets the ship in flight. Tearfully uttering his last words, "I don't want to go," the Tenth Doctor violently regenerates into the
Eleventh Doctor, causing severe damage to the console room and sending the TARDIS crashing back down to
Earth.
Continuity At the start of "Part One" the Doctor explains his delay to Ood Sigma. Among his various adventures, he mentions having married "
Good Queen Bess" which eventually happens in "
The Day of the Doctor". One of the two dissident Time Lords, described as "The Woman" in the credits, visits Wilfred on several occasions, appearing and disappearing in unexplained ways. When she lowers her arms to stare at the Tenth Doctor he appears to recognise her, but when later asked by Wilfred about her identity, the Doctor evades the question. British newspapers
The Daily Telegraph identified the character as the Doctor's mother as early as April 2009, with the episodes' writer
Russell T Davies writing in an email to journalist
Benjamin Cook, "... But of course it's meant to be the Doctor's mother." The Doctor at one point addresses the Lord President as "
Rassilon", the name of the founder of Time Lord society from the classic series, although the character is only identified in the credits as "The Narrator" in part one and "Lord President" in part two. In the accompanying episode of
Doctor Who Confidential, Davies stated that the character's name was indeed Rassilon. Verity Newman is played by
Jessica Hynes, the same actress who played Joan Redfern, who is Verity's great-grandmother, in the episodes "
Human Nature" and "
The Family of Blood". The name "Verity Newman" is based on
Doctor Who creator
Sydney Newman and the show's first producer,
Verity Lambert. Professor John Smith averred that his parents were Verity and Sydney. A pocket watch featured prominently in the plot of both Hynes's original episodes, and a pocket watch is featured on the cover of Newman's book. After regenerating, the Eleventh Doctor is disappointed that he is "still not ginger", referring to the Tenth Doctor's comment "Aw, I wanted to be ginger... I've never been ginger!" in "
The Christmas Invasion". ==Production==