In The Day of the Doctor, all 13 Doctors turn up to help save Gallifrey, and it's assumed that Ten, Eleven, and War have summoned the rest. Given Twelve's presence - a form that Eleven hasn't yet seen - how come Eleven doesn't know he's going to regenerate again? In The Time of the Doctor, he tells Clara very clearly that he can't.  Two possible answers that don't quite work:   Twelve wasn't summoned; he turned up of his own accord (because Eleven's experiences are in his past but in the future of all the others). But if he remembered what really happened that day, then Eleven should have remembered too; also, even if he wasn't summoned, the Gallifreyan defence council saw him, and Eleven should have made the obvious deduction from the Time Lord General's exclamation "thirteen!" Eleven lost some of his memories of the end of the Time War, due to being together with too many versions of himself (Ten and War definitely forgot everything that happened, because 'the time streams were out of sync' or some other wibbly-wobbly timey-wimey stuff). But Clara should have remembered Twelve's appearance, since she was presumably with Eleven in his Tardis and no older version of herself was around, and her only rebuttal of Eleven's defeatist I-can't-regenerate I'll-die-on-Trenzalore speech is "you can change the future" rather than "we already know you'll regenerate again".   Why do Eleven and Clara both seem to forget having (summoned and) seen Twelve?
123395
The 13th Doctor, Capaldi, showed up in "The Day of the Doctor" when the Doctors froze Gallifrey.   So, if the 12th Doctor saw him back then, how come he thought he was the last Doctor at the episode "The Time of the Doctor"? Could he have just forgotten?
26015
What are the catchphrases of the eleven (at the time of this posting) Doctor incarnations in Doctor Who?  For example I know of a few:     Chris Eccleston (9th Doctor): Fantastic! David Tenant (10th Doctor): Allons-y!, I am so sorry   Et cetera.  Does anyone have a list of all of the doctor's catchphrases over the years?
98324
Is it true that The Doctor can only regenerate 12 times? Because if it is, the series won't last much longer. Matt Smith's Doctor is number 11 - that only leaves two more, right?
23749
I once asked a question about the time line of an incredibly complex time travel movie on this site and received some incredibly elegant explanations. I'm wondering if you guys can explain Arrival too.   She learns an alien language which allows her to think in such a way that she knows the future. In the future, an important leader tells her at a world convention that he remembers when she called him on his personal number and got his attention by telling him his wifes dying words.  He then proceeds to give her his cell number and tells her his wife's dying words. In the "past", as she "sees" this "memory" of the future conversation, she uses this number to call him and tells him those words.   How does that work? Mind blown. Is there even a logical way to explain this?
110241
River Song only really knew two Doctors, as far as we know, and was clearly most familiar with Eleventh. Why would Tasha Lem think he has a new body if she's an incarnation of River?  Why would Eleventh rally her against the "psychopath" she's been fighting "all her life" if she isn't River?
103917
The Red Dwarf episode Tikka to Ride has confused me more than any previous episode:   How was it possible for the crew to use the Time Drive to travel back to 1960's Earth, when in the previous episode, Out of Time, made it clear that they couldn't use it to travel through space (they'd need a Space Drive for that)? In the latter, use of the Time Drive merely left them in "pre-Renaissance deep space"! How was it possible for JFK to kill his past self - would time not have simply reset to just before the Dwarfers met him, in the same way that it reset to just before the Dwarfers were killed by their own future selves? (As Lister tried to explain at the beginning of the episode.)
15048
In , Arthur, Ford, Zaphod, Trillian, and Marvin have just stolen Hotblack Desiato's stunt ship after leaving Milliways and traveled into the past 2 million years before their own time.      ”Trouble is,” said Ford, ”that the one instrument in this whole ship that   is giving any reading is worrying me. If it is what I think it is, and if it’s   saying what I think it’s saying, then we’ve already gone too far back into   the past. Maybe as much as two million years before our own time.”   As they realize that this ship is about to crash into the sun, they discover a teleportion device (their only means of escape) and leave Marvin behind to control it so they can escape despite the fact they have no idea where they might end up. Arthur and Ford end up on the Golgafrincham ship which shortly thereafter crash landed on pre-historic Earth (i.e. roughly 2 million B.C.), and Zaphod and Trillian end up back on The Heart of Gold.      ”I trust you had a pleasant meal?” said Zarniwoop to Zaphod and Trillian   as they rematerialized on the bridge of the starship Heart of Gold and lay   panting on the floor.   As I understand from the beginning of the book, at this point the Heart of Gold had been left with Zarniwoop alone on the ship in Arthur's "own time" (in the 1980's). There doesn't really seem to be any explanation as to why the teleportion device sent Zaphod and Trillian 2 millions years into the future as far as I can tell.   So, am I misinterpreting something to the story and the gang really left The Heart of Gold 2 million years before their own time, or did the teleportion device also act as a time machine when Zaphod and Trillian stepped into it? Or perhaps did Zarniwoop have The Heart of Gold travel back in time?
29806
In "The Woman Who Fell to Earth (S11 E1)" the Doctor is found on a train after an alien appearance. When she suggests that the creature that fell through the roof of the train (not her) was an alien, Graham says "Don't be daft, there's no such thing as aliens."   However, at this point, there have been several major alien events on Earth, and by this point I thought aliens were common knowledge (though not many people know much about them). As I recall, just last season alien pyramids were landing on Earth.  On the other hand, it's possible that one of the various reboots or time messes changed on Earth changed the situation.  Given the events of the previous season, why would this man be skeptical of the existence of aliens?
59337
During the  story arc, the cracks in the universe absorb a number of creatures, erasing them completely from time:   Amy Pond's mother and father. The military clerics Phillip, Crispin, Pedro, and Marco in . The  in . Rory's corpse in . Also, apparently, . ;)   However, there are 5 characters/species that are able to be close to the cracks, in some cases for long periods of time, without getting erased from time:   Amy Pond, who had a crack in her room for years but never got absorbed by it, even though her parents did. The Doctor, who reached into a crack to pull out a piece of the exploding TARDIS in . , who was able to escape prison by fleeing into Amy's house through the crack in her wall. An , who was peering at the Doctor and Amy through the crack in her wall in . The , who fled their damaged world for Earth through a crack in .   Are there any potential in-universe explanations for why the cracks in the universe are not lethal to these few characters?
47829
So all wizards get an invitation to Hogwarts at 11... How do they know whom to invite?  If a wizard is Muggle-born, then nobody would know about their existence.  Or do they register some weird magical stuff being done by them before 11?
46280
In this year's Christmas special The Husbands of River Song, why did River      take so long to realise that the man accompanying her was in fact the Doctor?   For most of the episode, I assumed      she'd forgotten all about him or had her memories removed or something, as she was so dull-headedly missing all the glaring hints he was dropping.   But this doesn't appear to be the case, as      she eventually does realise, without any immediate prompting.   So how come this didn't happen earlier? The last thing River seems to be is stupid!  And the other side of the coin: how come it did happen when it did? Did all the pieces of the puzzle finally slide together in her head, or was there some specific prompt at that moment which I missed?
47531
In Goblet of Fire, after the last task why didn't they simply use the pensieve to restore Harry's memory instead of making him relive the events?  Wouldn't this provide valuable evidence to make everyone believe Voldemort is back? It would be easier to make a ‘fellowship' if everyone was aware of what was coming which was clearly what Dumbledore wanted.  So why didn't he use the Pensieve?
102376
I'm finally getting around to watching Doctor Who. I'm the kind of guy who wants to start at the beginning and work my way to the present day from there. I know that's not what many people would recommend, but I've watched more series from around that time, so I think I sort of know what I am getting into. (I've seen the original Star Trek, Blake's 7, the original Battlestar Galactica and even Galactica 1980).  Now, the original Doctor Who-series has this strange history where a number of tapes have been lost. Of course, when something is lost, it can be found again and a number of the lost episodes have been found. I took a look at wikipedia where it talks about serials, some of which are complete again, while others still miss one or more episodes. I'm not too interested in watching incomplete stories, so my plan is to watch the serials that are complete and any non-serial episodes (if there are such episodes).  Now, since those are what I plan to watch: what is the list of episodes when taking out any incomplete stories?
98048
In the episode “The Angels Take Manhattan” the Doctor fixes River Song's hand with regeneration energy. Now, after the events of “The Time of the Doctor”, we see that actually he was the last incarnation and technically should not have any regeneration energy left in him.  Is this a plot inconsistency?
113700
In Doctor Who 2005: Big bang 2.0, the Doctor appears with a hat or something and a mop in his hand to rescue himself and Amy Pond after he is sealed shut inside the Pandorica. How can the Doctor come out of the Pandorica to do this? What event triggered this? Is it the act of universe on itself to re-establish the balance to the natural order of events, or is he an entirely new doctor from another time rescuing himself? I did understand everything that happened before and after the Doctor came back in time and gave Rory his sonic screw driver but I am not able to figure out the appearance of the Doctor himself...
62063
How is it that       The Master   Came to be in the Nethersphere?  The last time we saw him      He died and refused to regenerate.  The Doctor even cremated his body.   So, given what previously happened to him, how was he now able to      Regenerate as Missy and take over the Nethersphere?
44342
In Star Trek: Voyager, episode 23 of season 4 (), the episode begins with a civilization unknown until now. They claim to hold the ruins of the USS Voyager, which has otherwise contributed to the history of this civilization in a negative way, whereby Captain Janeway formed an alliance with the enemies of the people in question.  In the historical reconstructions of this event, we see many parts belonging to the ship, such as the Doctor.  This one -- having been deactivated during all these years -- still seems to be several centuries ago. The Doctor is therefore considered as the last "living" witnesses of this war.  The USS Voyager was considered a heavily armed warship with a restless and violent crew. The Doctor has done everything to set the truth about that time, and finally, all ends well, history is approved.  However, what is really going on? In the other episodes, the Doctor is always present, as well as the crew members, and the USS Voyager. At the end of the series, they all return to Earth.  What about this episode that seems to be out of the scope of the story?    I couldn't find any explanation about this episode, except that we could consider it as a separate story, but it doesn't really make sense to put an episode that has nothing to do with it in the middle of the series (even if it's very good and fits in pretty well).  I don't think this question is a duplication of , because this one is about the whole episode, as well as what really happened to the crew.