The Time of the Doctor (TV story)

The Time of the Doctor was the 2013 Doctor Who Christmas special. It was the 800th episode of the series and the final appearance of Matt Smith as the Eleventh Doctor. It served as a conclusion to the entirety of the Smith era, bringing back both the Silence and Trenzalore and bringing their stories to a close. Karen Gillan also made a surprise cameo as a hallucination of Amy Pond, rounding out Smith's era.

The special tackled an issue that hadn't been talked about since the series came back in 2005: that of the limited amount of regenerations, introduced in The Deadly Assassin. It confirmed that the Doctor had actually used up all twelve of his possible regenerations, before being granted a brand new regeneration cycle at the end of this story. It also served as Peter Capaldi's formal introduction as the new Doctor, after making a surprise cameo appearance in The Day of the Doctor.

The special marked the departure of producer Marcus Wilson, finishing his work with the series after Matt Smith's final scene was filmed.

Synopsis
Orbiting a quiet backwater planet, the massed forces of the universe's deadliest species gather, drawn to a mysterious message that echoes out to the stars. Among them, the Doctor. Rescuing Clara from a family Christmas dinner, the Time Lord and his companion must learn what this enigmatic signal means for his own fate and that of the universe.

Plot
The Doctor is among thousands of ships orbiting a planet after hearing a message being broadcast from it, a message that no-one can understand. He visits a ship, holding a Dalek Eye Stalk to show his bravery. Unfortunately, the ship belongs to Daleks, who fire at him until he teleports back to the TARDIS, where a disembodied Cyberman head that he calls "Handles" is plugged into the console. Clara calls the Doctor via the TARDIS phone, and pleads that he pretend to be her boyfriend for her family's Christmas dinner. The Doctor then accidentally visits a Cybership while holding Handles, where he is also shot at until he returns to the TARDIS again.

The Doctor picks up Clara from her home (after causing major embarrassment when he forgets to update his holographic suit to be visible to her family) and takes her to the planet's orbit. When asked to identify the planet, Handles claims it is Gallifrey, which the Doctor refutes. The two are invited aboard the Papal Mainframe, a space church headed by Mother Superious Tasha Lem. Tasha and the Doctor discuss the signal coming from the mysterious planet, while Clara repeatedly sees and forgets several Silents that surround her. She bursts into the room where the Doctor and Tasha are conversing, but forgets why after she does so.

Tasha sends the Doctor and Clara to the planet, but accidentally places them in the middle of an ambush by Weeping Angels. They escape to a town called Christmas, surrounded by a truth field, so no one can lie. Here the Doctor finds a crack in time through which the message is being broadcast. Using a copy of the Seal of the High Council he once took from The Master in the Death Zone, he has Handles translate it. The message is a repeat of the same question: "Doctor who?" The Doctor says this is the Time Lords, trapped in a pocket universe, trying to get out. If the Doctor speaks his name, the Time Lords will know they are in the right place and come through, and all the alien species above will descend on the planet and begin the Time War anew. Tasha contacts the Doctor, telling him this cannot happen and the Doctor refuses to withdraw and let his enemies destroy the planet, which she reveals to be Trenzalore – the place where he is supposed to die.

The Doctor tricks Clara into plugging a device into the TARDIS that transports her home. For the next 300 years, he defends Trenzalore from his enemies. He defended Chrismas in a number of ways. One time he disabled the cloaking device on a Sontaran vehicle, allow the Church to destroy. On another occasion, he tricked a wooden Cyberman, created to be too primitive to set off the alarm, into destroying itself after using the sonic and the truth field to make it think its gun had been turned around. According to Tasha, the Doctor seemed to forget of life before the siege. He spent his sparetime fixing the toys the children played with. He grew close to a child called Barnable.

Clara returns after gripping to the sides of the TARDIS and forcing the TARDIS to increase the shields and bring her back through the Time Vortex, slowing it down considerably. She meets a Doctor who has spent three centuries defending the town of Christmas. He now has grey hair and needs a walking stick. The Doctor and Clara at first exchange angry remarks- Clara is strongly upset about being left behind without even a good-bye, and the Doctor becomes irritated that she returned to Trenzalore. However, the two of them can't help but embrace in a warm hug.

The Doctor decides to take Clara to his new home on Trenzalore, the bell tower in Christmas. He has taken residence in the same room with the time crack, now adorned with hundreds of drawings given to him by the children of Christmas. Each drawing shows a child's love for the Doctor and provides a peek back at his bygone adventures in this incarnation, after recounting many stories over the passing centuries to entertain the kids. However, Handles has heavily aged alongside the wearisome Doctor and barely functions. The rusted Cyberman head announces he has developed a fault through his stuttering electronic voice, warning that he doesn't have much time left. Shortly after, Handles dies – but not before finally reminding him that he needs to patch the TARDIS phone back into the console. The Cyberman ceases to function, and the Doctor despairingly shakes his head, like a child trying to make a broken toy work. He quietly sobs, "Thank you, Handles, and well done. Well done, mate."

The sun rises over Trenzalore, and the Doctor informs Clara that he watches the sunrise every day to remind himself of what he is protecting. Though she thinks it is a beautiful sight, Clara is pressed to ask the Doctor why he decided to drop her back on Earth. The Doctor feared that if he had allowed her to stay, he'd outlive her or lose her in battle, and he would have buried her long ago. Clara defiantly tells the Doctor she would have found away to prevent him from being stuck on Trenzalore, but the Doctor is quick to disagree; "Everyone gets stuck somewhere eventually, Clara. Everything ends." Clara still isn't convinced it applies to the Doctor, even though he has grown quite old. She thinks he cannot die, and instead regenerates with a new face each time he is about to perish. The Doctor grimly reveals to her that Time Lords can only regenerate twelve times. She surmises that this shouldn't be a problem, as he is the "eleventh Doctor". He reminds her of "Captain grumpy", his Time War incarnation; although he didn't call himself "the Doctor", it still counted. So, too, did the regeneration used by the Tenth Doctor during his Meta-Crisis. He is therefore on his thirteenth, and final life. He and Clara then watch the sun rise for a few minutes, until a thunderous boom from overhead reveals Tasha Lem's holographic face in the sky. She announces to the Doctor that the Church of the Silence is requesting parley. The Doctor is being allowed to meet with her to discuss a truce, with his rights and safety sanctified. Tasha offers to have him transported to the Papal Mainframe, but the Doctor declines, knowing he's got his TARDIS back. After Tasha deactivates her hologram, the sun has already vanished over the horizons of Trenzalore. The Doctor reminds his companion, "Everything ends, Clara. And sooner than you think."

The Doctor and Clara prepare to board the TARDIS, where they find Barnable guarding it, wondering if the Doctor will leave Christmas. He gives the boy assurance that he's known the Doctor long enough to trust he will return. Barnable promise to wait for him, much like a certain girl who also waited for the Doctor. Clara and the Doctor then arrive back on the Papal Mainframe, now converted into the Church of the Silence, where Tasha still remains in power as a youthful Mother Superious who has blocked off her natural ageing process. After centuries of battle with the Church, the Doctor now understands the origin of the Silents. The memory-proof race of aliens are genetically engineered confessional priests, whom Church members can confess their sins to, then later forget. When the Doctor returns to Tasha's chapel, he discusses the parlay at a table instead of a bed. Tasha explains a renegade faction of the priests belonging to a sect of the Church called the Kovarian Chapter broke away and travelled back in time to stop the Doctor from reaching Trenzalore. However, Tasha has been helpless against the onslaught of the Doctor's enemies since his long battle began. The Mainframe itself was attacked by the Daleks a three days prior to their meeting. The Doctor asks why she didn't call for help. Tasha fearfully replies, "I tried! I died in this room, screaming your name! Oh... I died. It's funny the things that slip your mind."

With those words, the horrified Docter discovers that Tasha and her crew have been killed by the Daleks and turned into Dalek puppets, with eyestalks bursting out from their skulls- even the Silents. This is a trap set by the Daleks to snare their greatest enemy. As Tasha succumbs to the puppet conversion, Three Daleks enter the chapel and accost the Doctor. He is surprised that they now remember who he is, after Oswin Oswald purged Pathweb of their information about him. The Daleks have reasserted their memories after harvesting replacement information from Tasha Lem's cadaver. Because of this, the Daleks have redoubled their efforts to stop him from saving Gallifrey, well aware their nemesis race, the Time Lords, could return to wipe them out. The Doctor prepares to surrender, allowing the Daleks to think he would let Clara be exterminated. Clara plays along with the bluff, realising the Daleks would kill her even if he tried to save her rather than betray. The Doctor then praises Clara for being a strong-willed woman, but also berates Tasha, claiming her church was useless and she was too spineless to be of any help to him in the war. The insults urge Tasha to regain her mind, subconsciously furious at the Doctor, giving him a fierce slap. She then uses her puppet form's gunstick to wipe out the Daleks. The Doctor kisses her and apologises for having to make her angry, encouraging Tasha to keep fighting back the Dalek reprogramming inside her. As he and Clara escape to the TARDIS with Tasha's help, Tasha protests that she has kept fighting for the sake of the peace, not the Doctor and his ego.

Inside the TARDIS, a timer bell dings, alerting the Doctor that Clara's turkey has finished cooking- or woken up. Though Clara is happy to return back to Earth, the Doctor sees Barnable still beside his TARDIS and refuses to abandon him, remembering how he left behind a girl who waited. Refusing to give him the same burden of a broken promise, abandon a planet under a vicious onslaught, and the fact he has become so old already, the Doctor quietly replaces the charger inside the TARDIS and returns to Christmas town, while Clara thinks he has stepped out, only to find that he has tricked her into leaving his company for the second time, as the TARDIS soon makes a return flight to Trenzalore right after she exits it. This time, she really is stranded without any means of return.

On Trenzalore, Barnable questions why the Doctor has brought back his TARDIS if he doesn't intend to leave the planet. He explains it is a reminder that he might leave someday. However, his words are hollow. The Doctor continues his long war against his enemies for many more centuries, well after Barnable's lifetime. However, now on good terms with the Church again, he is able to ally with their Silents instead of facing them as villains, and then defend the planet from attackers above, until only the Daleks are left. But the battles continue for so long that it becomes unclear exactly how much time has even passed since they first began.

Meanwhile, having returned to her family (who assume she's broken up with her "boyfriend"), Clara's grandmother consoles her with memories of her late husband. They only manage to make an upset Clara cry when she notices how similar they sound to her own memories of being with the Doctor. Fortunately, she later hears the TARDIS engines and joyfully runs outside, thinking the Doctor has changed his mind. Instead, she finds the TARDIS piloted by Tasha, claiming, "Flying the TARDIS is easy, it's flying the Doctor that's hard." She returns Clara to Trenzalore to see the Doctor, saying she could not let him die alone.

Clara reenters the Doctor's old sanctuary in the bell tower to find an elderly man toiling away at fixing a child's wooden horse. After announcing her presence to him, he turns around to reveal a heavily wrinkled face with long, balding white hair, and familar glasses perched on his weakening eyes- a dying Doctor on his last legs. The Doctor is now very old and often acts slow and slightly confused. He seems to have developed dementia, shown by how he thinks a man is Barnable despite the man telling him he isn't. He still won't release the Time Lords, knowing that it would mean Hell for all the universe. All his enemies have withdrawn save for the Daleks, whom he has been fighting with the aid of the Silence. The Daleks launch their final attack and the Doctor, finally out of ideas, weapons and regenerations, goes to meet them. Clara cannot watch this and returns to the crack in time, pleading with the Time Lords to save the Doctor, saying: "His name is the Doctor! All the name he needs, everything you need to know about him, and if you love him, and you should, help him!". The crack vanishes. At the top of Christmas's clock tower, the Doctor is preparing to die. He admits defeat to the Daleks, and jests that it took them so long to plot a proper way to kill him, that he's doing it himself. Then, the crack appears in the night sky and through it, the Time Lords grant the Doctor a new cycle of regenerations. This happens just as the Daleks begin to taunt him: "The rules of regeneration are known! You have expended all your lives!" The Doctor notices regeneration energy building inside him and defies his enemies, boasting that his thirteen regeneration is "breaking some serious science" and is "gonna be a whopper"! As his regeneration process begins, Christmas town's clock strikes twelve and the Doctor triumphantly returns the banter: "IF YOU WANT MY LIFE, COME AND GET IT!" He whips his arms around and channels his regeneration as a bioweapon, using the energy to destroy the Daleks and their ship. With a final, devastating blast to the Dalek gunship, he shouts into the sky: "Love from Gallifrey, boys!" An enormous explosion results from this regeneration. It wipes out every single Dalek attacking the planet, but as a result of its ferocity, levels most of Christmas.

In the aftermath of the Doctor's regenerative backdraft, the villagers of Christmas try to react to the destruction of their town. Though some are quite shaken up, most of them are determined to rebuild now that the war is over. Clara quickly returns to the TARDIS in search of the Doctor, who evidently ran back to the ship in a hurry. She sees his worn out winter clothes frantically splayed on the TARDIS console floor and one of his favourite meals sitting on the control panel. The Doctor steps back into the room dressed in his normal clothes for one last hurrah as this version of himself, whose youth has been restored. The Doctor informs Clara that this is "a reset", enjoying a bowl of fish custard, a meal he enjoyed at the very start of his now fading incarnation. Despite this renewal, he tells her the regeneration can't be stopped, and that it is simply taking some time to begin. Although revitalised, he will still change. Clara is saddened greatly when she realises that the Doctor she knew is about to disappear. However, the Doctor is not upset about the regeneration yet to come. He understands how fast everything about him and life itself can be gone in a moment, because it is always changing. He comforts Clara by telling her that times change, and so must he. The Doctor's hand begins to glow with regenerative energy and he makes peace with the fondest memories he had during this incarnation before its time is up.

Suddenly, he sees a little girl prancing through the balcony of the TARDIS with cheerful giggling, with every inch of its walls covered in her drawings of their adventures together, alongside those given to him by the children on Trenzalore. Aloud, he starts to reminisce about the past companion Clara never met: Amelia Pond, The Girl Who Waited, the one he lost so long ago - "the first face this face saw." Happily awaiting the regeneration, the Doctor gives this incarnation a fond eulogy. He assures Clara, "We all change, when you think about, we are all different people, all through our lives, and that's ok, that's good, you've gotta keep moving, as long as you remember all the people that you used to be. I will not forget one line of this, not one day, I swear. I will always remember when the Doctor was me."

He sees an adult Amy Pond in the TARDIS - though she's been gone for so long and has been lost to him for hundreds of years - with her wedding ring on; it's not just her returning, but Rory too, in a symbolic way - the Eleventh's first companions are seeing him on into a new life. Amy descends from the balcony, places her hand against his cheek, and tells him, "Raggedy Man, good night."

The Doctor places his hand against her face as well, only to see he's reaching out for air. Ready to move on and become a new man, the Eleventh Doctor lets go of his greatest attachment to this incarnation – he removes his cherished bowtie, dropping it to the floor. In tears, Clara begs him not to change. He smiles, consoles her once more, and then suddenly jerks his head back.

In barely a second's time, the Doctor has completely changed from the youthful alien Clara knew, to an older-looking man with curled silver hair and the impeccable razor-sharp gaze of the Doctor that joined the previous twelve to rescue Gallifrey from the Time War. Utterly dumbfounded by this new face, Clara can only watch as the Doctor stares her right in the eyes, before keeling backward, clutching his waist. He proclaims, "Kidneys! I've got new kidneys! I don't like the colour." Suddenly, the TARDIS begins shaking, and to Clara's horror, the new Doctor not only tells her that they're crashing into something, he also implies he's suffering from partial amnesia when he asks her if she knows how to fly the TARDIS...

Cast

 * The Doctor - Matt Smith
 * Clara - Jenna Coleman
 * Tasha Lem - Orla Brady
 * Dad - James Buller
 * Linda - Elizabeth Rider
 * Gran - Sheila Reid
 * Colonel Albero - Mark Anthony Brighton
 * Abramal - Rob Jarvis
 * Marta - Tessa Peake-Jones
 * Barnable - Jack Hollington
 * Colonel Meme - Sonita Henry
 * Handles' Voice - Kayvan Novak
 * Young Man - Tom Gibbins
 * Voice. - Ken Bones
 * Cyberman - Aidan Cook
 * Voice of the Daleks & the Cybermen - Nicholas Briggs
 * Dalek 1 - Barnaby Edwards
 * Dalek 2 - Nicholas Pegg
 * Silent - Ross Mullan
 * Sontaran - Dan Starkey
 * Weeping Angel - Sarah Madison
 * Wooden Cyberman - Daz Parker (uncredited)
 * with Karen Gillan as Amy Pond, and introducing Peter Capaldi as The Doctor

Species

 * Amongst the species massing at Trenzalore in response to the mysterious signal are the Daleks, the Cybermen, the Judoon, the Sontarans, the Silurians, the Terileptils and the Slitheen family.
 * The Cybermen are shown to use the Cybus phrase "Delete" in one of the drawings.
 * The Doctor traps a Weeping Angel with a mirror so that it is forced to look at itself.
 * A puppet of a Monoid is seen.
 * A drawing of what may be one of the Racnoss and a Pyrovile hangs on the wall of the clock tower.
 * A drawing of an Ood and some Adipose hangs on the wall of the clock tower.
 * The Doctor mentions an instance when he arm-wrestled a Draconian.

Story notes

 * This is the first televised regeneration story in which the Doctor regenerates at the end of the story to end on a shot of a character other than the Doctor and the second since The War Games not to end on the Doctor's new incarnation. In this case, this story's final frame shows Clara's reaction to the newly regenerated Twelfth Doctor, not the Twelfth Doctor himself.
 * This story takes place over a longer amount of time than any other, with the Doctor having lived more than three-hundred years (probably far more) since the beginning of the episode.
 * This is the shortest regeneration story (in overall run time) to be broadcast on BBC1, as The Night of the Doctor was only shown on Red Button.
 * The regeneration is presented differently from other regenerations shown in the revived series, with the use of a prolonged explosion of energy occurring before the actor transitions. The final transition consists of a brief flash of light around the actor's head.
 * Regenerations in the revived series are presented as getting bigger and stronger each time. The ninth Doctor's regeneration into the tenth Doctor's introduced the regeneration flames. The Tenth Doctor's regeneration into the Eleventh Doctor's used the same effect but as a result of holding it in for too long, causes damage to the TARDIS. When Eleventh Doctor's regenerative abilities are reset into a new cycle, the effect is big enough to destroy a Dalek ship. However, when the first regeneration after the reset completes itself (the physical change from Eleventh to Twelfth), it is shown as a simple transition. This could be a callback to the first regenerations from the classic series, insinuating that regenerations grow increasingly violent and dangerous as Time Lords near the end of their regeneration cycles.
 * Before filming for this special began in September 2013, Matt Smith agreed to play a role in the American film, How to Catch a Monster. His character was depicted as having a thug-like buzz cut, which meant Smith had to have his signature quiff completely shorn off. By the time the filming was underway for the special, Matt's hair had not grown back enough to fill out the Eleventh Doctor's hairstyle. It was decided that he would use a hairpiece identical to his quiff, which also made it easier for makeup artists to apply ageing effects through older-looking hairpieces. In a humorous moment in the episode that references the wig, the Doctor, surprising Clara, removes a wig to reveal he is bald. (A cap was used to achieve the effect)
 * Though it can be assumed that The Doctor's hair grew back to normal during the many long years he stayed on Trenzalore and before he regenerated.
 * Coincidentally, Karen Gillan had also shaved her head for a role in the Marvel film Guardians of the Galaxy and wore a wig alongside Matt Smith in their final bow on the series.
 * Smith can also be seen wearing a wig in the teaser trailer for The Day of the Doctor.
 * During the filming of the special, Matt Smith suffered an injury to his leg and later had to visit a physical therapist to recuperate from the accident. This injury inspired a rumour that the script for the special would be altered to have the Eleventh Doctor lose a leg when the Weeping Angels attacked. The rumour was proven false when no such event took place in the episode.
 * This is both the second Christmas special and the second regeneration story to feature the Cybermen, being preceded by The Next Doctor in 2008 and The Tenth Planet in 1966 respectively. It is also the third regeneration story to feature the Daleks, the first being The Parting of the Ways in 2005 and the second being The Day of the Doctor in 2013. The show's very first Christmas episode, 'The Feast of Steven' in 1965, was also part of The Daleks' Master Plan but the Daleks were notably absent from that particular episode. This is the eighth story overall to feature both Daleks and Cybermen in the same episode with major roles, preceded by The Five Doctors, The Ultimate Adventure, Army of Ghosts/Doomsday, The Pandorica Opens/The Big Bang, Return to Earth, The Mazes of Time and The Eternity Clock.
 * Additionally, Daleks, Cybermen, Sontarans, Silurians, Judoon and Slitheen were all part of TV: The Pandorica Opens; Cybermen, Sontarans, Silurians and Judoon were all part of TV: A Good Man Goes to War; and Daleks, Cybermen, Silurians and Silents were all part of GAME: The Eternity Clock.
 * Moreover, Daleks and Sontarans were both part of AUDIO: The Five Companions; Daleks and Silurians were both part of GAME: Evacuation Earth; and Daleks, Cybermen and Silurians were all part of GAME: The Mazes of Time.
 * This is despite the fact that Steven Moffat said he had no desire to write a story in which the Doctor faces all of his enemies (REF: The Brilliant Book 2011) yet he is the writer that has come closest to doing this after writing three episodes now which have featured multiple recurring enemies.
 * With their role in The Day of the Doctor, this marks the second time the Daleks have featured in two consecutive episodes, excluding multi-part stories and flashbacks. The first time was Frontier in Space and Planet of the Daleks. However, Planet is a continuation of Frontier and both deal with parts of the same Dalek threat, whereas some time has elapsed between the events of Day and Time and they both involve two separate Dalek threats: the Time War and the New Dalek Paradigm respectively. If Frontier and Planet are considered to be one story, then The Day of the Doctor and The Time of the Doctor can be considered the first stories to do this.
 * Though considering himself not much of a "weepy person", during the table read-through for the script of The Time of the Doctor, Matt Smith had an emotional breakdown while trying to read his final lines and cried. Steven Moffat immediately came over to his seat and hugged him while Jenna Coleman tried to avoid being overcome with sadness herself.
 * The new Doctor not knowing how to fly the TARDIS seems to suggest he has managed to have partial memory loss after regenerating. This is the third time the Doctor has had amnesia/partial amnesia after regenerating as the Eighth Doctor soon after his own regeneration could not remember who he was at all until much later. Similarly, the Seventh Doctor suffered partial amnesia shortly after his regeneration, being unable to differentiate the Rani and his companion, Mel Bush. (TV: Doctor Who)
 * The music that plays out Matt Smith's regeneration scene is a Series 7 music track composed by Murray Gold, "Infinite Potential", which is a solemn version of "The Long Song" heard in The Rings of Akhaten. It is followed by a sampling of the Series 6 track "My Silence" as he removes his bow-tie.

Ratings
8.3 Million.

Filming locations
to be added

Rumours

 * Because of the leg injury suffered by Matt Smith during filming, the Doctor would lose a leg during the episode. This turned out to be false. The middle-aged and elderly versions of the Doctor, however, both rely on a walking stick to get around.  In addition, while in the TARDIS waiting for his regeneration to kick in, the youthful Doctor is clearly limping in pain as he uses the console.
 * On 20th December, the Daily Star tabloid published the spoiler that a "fan favourite" character would appear in the episode during the regeneration. This led to several days of speculation as to who it might be before it was revealed that Amy Pond was the returning character.

Production errors

 * When the Doctor and Clara arrive at the Papal Mainframe, the right column of the TARDIS is noticeably missing.
 * When the doctor is on the dalek ship at the beginning of the episode, one of the Daleks' eyestalk lights are not turned on.

Continuity

 * The Doctor tricks Clara into returning home in the TARDIS, presumably using Emergency Program One, although modified in that the TARDIS was programmed to return to him after Clara's departure. The Ninth Doctor previously tricked Rose into returning home in the TARDIS, and just like Clara, she manages to return both herself and the TARDIS to the Doctor, and playing a part in saving the Doctor and activating his next regeneration. (TV: The Parting of the Ways).
 * Handles' response "Affirmative" parallels that of K9 to the Fourth and the Tenth Doctors. (TV: School Reunion)
 * The Doctor explains the Cracks in time and the events of the reboot of the Universe to Clara. (TV: The Big Bang)
 * To allow translation of the message, the Doctor uses a Seal of the High Council of Gallifrey, claiming he "nicked it off the Master in the Death Zone." The Third Doctor did exactly that, incorrectly assuming that the Master had himself stolen it. The Doctor stated at that time he would return it to the High Council at his "earliest convenience". (TV: The Five Doctors)
 * The Doctor confirms to Clara that although he is the Eleventh Doctor, he has used all twelve of his regenerations, and is therefore unable to regenerate again. The two "missing" lives are the War Doctor (who was not generally referred to as the Doctor due to his actions in the Time War, and had in fact rejected the title), (TV: The Day of the Doctor) and the abortive regeneration by the Tenth Doctor when he sent his regenerative energy into a matching bio-receptacle (his severed hand) rather than change. (TV: Journey's End)
 * It is confirmed that Time Lords can only regenerate twelve times (for a total of thirteen lives), but that a Time Lord can be granted a new regeneration cycle. Judging by the Doctor's reaction when this happens to him ("We're breaking some serious science here, boys!"), this is uncommon. The Master had been offered a new regeneration cycle by the High Council to persuade him to rescue the various Doctors trapped in the Death Zone, (TV: The Five Doctors) and was apparently given one when he was resurrected to fight in the Time War. (TV: The Sound of Drums)
 * Regenerative energy again proves to be damaging to non-organic objects, with the Doctor using some to blast the Daleks and their ship. When the Tenth Doctor regenerated, some of that energy hit the TARDIS console, causing major damage and sending it out of control. (TV: The End of Time, Part Two)
 * The Doctor visibly ages during the 300 years between when he sends Clara home and when she returns, gaining grey hair and wrinkles and requiring a cane to walk; he is therefore about 1500 years old at this point. (TV: The Day of the Doctor) By the time Tasha Lem returns Clara to Trenzalore once again, he has aged significantly further; it is unknown how much time passed between her second and third visits. This is the only time any incarnation of the Doctor is seen to have visibly aged over the course of time. There were other temporary aging incidents such as when the 5th and 10th Doctors briefly met (used to explain Davison being decades older) (TV: Time Crash), the 10th Doctor's aging at the hands of the Master (TV: The Sound of Drums), and the 4th Doctor's aging in the Argolin Machine in TV: The Leisure Hive.
 * By the time of his regeneration, the 11th Doctor is older than at least his first 2 incarnations or his 3rd-8th incarnations combined (based on stated ages; the later doctors lived shorter periods, with the War Doctor in particular being a short incarnation), having lived at least 600 years. Depending on how long passed between Clara's first return to Trenzalore and his regeneration, the 11th may be older than every other incarnation combined.
 * It is learned that Madame Kovarian led a faction of the 'Church of Silence' that broke off and travelled back along the Doctor's timeline, trying to stop him from reaching Trenzalore and answering the First Question. Their actions failed, and in fact caused the events they feared to occur; trying to blow the TARDIS up caused the cracks to appear, and the assassin they manufactured to kill the Doctor - River Song - ended up being the Doctor's wife and ally. The Doctor called this the Destiny Trap - "You can't change history if you're already a part of it."
 * A similar such paradox is set up during Day of the Daleks - the guerillas' assassination of Styles in the belief his death would prevent the Daleks' invasion of Earth actually led directly to it.
 * The Silents are revealed to be high ranking Confessional Priests of the Papal Mainframe (later the Church of Silence), which were genetically engineered to allow people to confess their sins without remembering doing so, accomplished by fashioning the priests so anyone looking at them would forget their encounter when they looked away.
 * As the Eighth, War, Ninth and Tenth Doctors did, the Eleventh Doctor examines his glowing hands before he regenerates. (TV: The Night of the Doctor, The Day of the Doctor, The Parting of the Ways, The End of Time)
 * The Doctor silently materializes the TARDIS on Trenzalore. (TV: The Dalek Invasion of Earth, The Time of Angels, The Impossible Astronaut)
 * The greatest fear in the Doctor's room from The God Complex is revealed to have been a crack in time.
 * The Doctor again uses the phone on the outside of the TARDIS, (TV: The Bells of Saint John, The Day of the Doctor) once more despite having previously claimed that it is not a real phone (TV: The Empty Child). It is revealed that this is because he keeps forgetting to patch it back through the phone on the console. (TV: World War Three, The Beast Below) Because of this, the TARDIS has generated a real phone, complete with stand, inside the call box. Earlier, the call box had a phone mounted to the side of its door. (TV: The Empty Child)
 * Clara now has her own TARDIS key. (TV: The Rings of Akhaten, Hide)
 * The Doctor uses "reverse the polarity" once more (TV: The Day of the Doctor), a favourite phrase of the Third Doctor.
 * The Daleks now once again remember the Doctor (TV: Asylum of the Daleks) due to harvesting the information from Tasha Lem's mind.
 * Dalek puppets reappear. (TV: Asylum of the Daleks) Tasha Lem is able to resist her conditioning and fire on three Daleks in a way that mirrors Jenibeth Blakely.(PROSE: The Dalek Generation)
 * The Doctor eats fish fingers and custard once more before regenerating. (TV: The Eleventh Hour, The Power of Three)
 * The Twelfth Doctor's first words — "Kidneys! I've got new kidneys!" — keep to the modern "tradition" of new Doctors immediately commenting on their bodies. Previously, the Tenth Doctor commented on his "new teeth", (TV: The Parting of the Ways) and the Eleventh on his legs. (TV: The End of Time) Past Doctors had similar comments later on. (TV: Spearhead from Space, Robot, TV: Doctor Who, TV: Rose)
 * The most lucid and frequent voice emanating from the crack in time is that of the General seen in The Day of the Doctor.
 * While regenerating, the Doctor hallucinates seeing his past companion Amelia Pond, similar to the Fourth and Fifth Doctors thinking of their past companions at the time of their respective regenerations. (TV: Logopolis, TV: The Caves of Androzani)
 * While the species themselves are not mentioned, Judoon rockets (TV: Smith and Jones, The Pandorica Opens) and Silurian Arks (TV: Dinosaurs on a Spaceship) can be seen among the fleets orbiting Trenzalore at the beginning. Terileptils (TV: The Visitation) and Slitheen (TV: Aliens of London/World War Three, Boom Town) are also listed among the species present.
 * While the Doctor is protecting Christmas, a Weeping Angel is seen next to a pane on which "Love from the Doctor" is written. (TV: Blink)
 * This is not the first time someone rode through the Vortex on the outside of the TARDIS. This was previously done by Captain Jack Harkness (TV: Utopia) and the Doctor himself (TV: Hide). It is the first time this has caused a delay in transport, probably due to the TARDIS purposefully not shielding Jack.
 * The town of Christmas has a small graveyard with headstones identical to those in the mass grave from Trenzalore's alternate future. (TV: The Name of the Doctor)
 * This is the first time in the revived series to acknowledge the fact the Time Lords have a limited capacity to regenerate twelve times. The Eleventh Doctor previously joked about this limit in The Sarah Jane Adventures episode Death of the Doctor, claiming to Clyde Langer he could regenerate 507 times (but if you add 5, 0 and 7 together, it adds to 12 meaning he had hinted it before).
 * The Doctor teaches the children of Christmas to do the "drunk giraffe" dance he performed at the wedding of Amy Pond and Rory Williams. (TV: The Big Bang)
 * At his oldest before the regeneration process, the Doctor's hair resembles his first incarnation's hairstyle.
 * The gathering of spaceships at Trenzalore is reminiscent of the Alliance which came to Earth in 102 AD for the Pandorica. In both cases, Daleks, Cybermen, Judoon, Silurians, Sontarans, Slitheen and Terileptils were part of the gathering. The Weeping Angels are the only race seen or mentioned here not known to have been in the Alliance. (TV: The Pandorica Opens)
 * The Sonic screwdriver still doesn't do wood. (TV: Silence in the Library, The Doctor, the Widow and the Wardrobe) This episode also shows that it doesn't do turkey.
 * During his time on Trenzalore the Doctor says "Christmas is protected" (TV: The Christmas Invasion, The Eleventh Hour) and that "cool is not cool," adding to the many things he says are not cool.
 * The puppet show put on display for the children of Christmas shows an adventure between The Doctor and a Monoid, an alien species last seen by the First Doctor. (TV: The Ark)
 * The Time Lords contribution to the Doctor's regeneration can be considered opposite to the reasons for his regeneration from the Second Doctor to the Third Doctor. (TV: The War Games)
 * The Doctor says "Geronimo!" with the children of Christmas, the last instance he ever uses that word. (TV: The End of Time onward)
 * The Twelfth Doctor and the First Doctor both started out on Doctor Who as relatively aged Doctors, have school teachers from Coal Hill School as companions, and don’t know how to fly the TARDIS.
 * The Heart of the TARDIS can now be easily opened up from a hexagonal panel beneath the main console unit. It was previously very difficult to access due to the risk of exposing oneself to the Time Vortex. (TV: Boom Town, The Parting of the Ways)
 * The Doctor still has a powerful dislike for wine, shown when he immediately spits out his wine back into its glass after sampling the drink that Tasha Lem courteously offers him. (TV: The Lodger, The Impossible Astronaut)
 * The Doctor fixes a little girl's broken toy train while staying at Christmas, but goes too far and bends to his desire to add modifications, such as anti-gravity flight mechanisms. He previously overhauled the Digby Estate with various unnecessary contraptions to impress Madge Arwell's children. (TV: The Doctor, the Widow and the Wardrobe) Going back to his previous incarnation, he made a DNA detector that went "ding" in the presence of a Zygon, but didn't know when to stop himself, giving it the ability to microwave frozen dinners from up to twenty feet and download comics from the future. (TV: The Day of the Doctor)
 * The aged Doctor taps his nose, much like the Curator did. (TV: The Day of the Doctor)
 * Some of Amy's drawings reveal previous episodes, you see the Saturnyne (TV: Vampires of Venice), Peg Dolls (TV: Night Terrors) and the new Daleks (TV: Victory of the Daleks)
 * Avoiding the use of time travel, if Kovarian used Demons Run as a base contemporaneously with the Siege of Trenzalore, then this story may be begin before and end after the 52nd century as the Battle of Demons Run takes place then. (TV: A Good Man Goes to War)

Home video releases
to be added