The broken window of the TARDIS is very clearly in shot when they exit on Trenzalore, and appears very prominently in the 'Grave TARDIS' that's grown.

Also, currently, the Doctor has entered his own timestream, which should be fatal to him.

I've long-held the theory that NotD, DotD and Christmas 2013 are a trilogy of episodes for the 50th which will end up featuring every Doctor in some way, including 'Twelve'.

So, by counting Journey's End and adding a mystery (Hurt) Doctor, the 50th would leave the Eleventh Doctor the last incarnation, and the anniversary *could* be used to spring-board the series afresh past that, with a new First/Fourteenth/Twelfth Doctor into 2014.

This situation was always going to get messy when it happened, but Moffat might as well try and wrap it up around the convoluted continuity that already exists when most people are watching and expecting an introverted episode, and then get going again with a big-name star in the role to pick things all up once more in the eyes of the public...

Of course, the real question is, if Matt's Doctor is on his last life, how the Doctor gets past all that...

Maybe 4 to 5 wasn't using The Doctor's regenerations...but the Watcher's.

IE he sends one back in time from whenever the hell the Watcher is supposed to be and it keeps him sustained for eternity in an everlasting loop.

I may have just been watching Red Dwarf with Lister being his own father due to time travel.....but yeah.

Didn't he use one up fixing rivers wrist in angels take Manhattan ?

I disagree. New Who loves to play around with the concept of regeneration. The sudden ability to prevent regeneration in Journeys End really did downgrade it in a very casual manner. Subsequent uses of regeneration haven't help either. It used to be "the end" for that incarnation of the Doctor. Now it might not be and that does make it a little less special to me.

This is a weird convoluted theory I've haphazardly come up with whilst reading this thread;

OK Matt Smith is the 11th Face, however, twelve regenerations have been used. IMO, fixing RIvers wrist transfers back her regens back to her, as she seemed awfully serious at the time if there was so little consequence to this action.

Also, in 'Let's kill hitler' The TARDIS says something along the lines of 'Regeneration not possible' and we presumed it was due to the poison lipstick, but could this be because he was out of 'regenerations' despite only having 11 faces.

OK here is where it gets weird, i think meta crisis counts, i also think at some point the time lords used 'meta crisis', and somehow in the Doctors timeline fused him with 8. (Thus making 8'half human') And that the resulting imalgimatiion(Somewhere between8,9 and meta crisis) is John Hurts' doctor.

This ,as far as I'm aware, does not break continuity, ties up some terrible loose ends and could actually work. Also, from the little we have seen of them both, JH and Meta crisis seem awfully similar.in personality, whilst the costume is of 8-9.

Now it is super late and im rambling, but i think the doctor will get get a new 'set of regens rather than becoming immortal.

How can he become imortal if he has allready seen his own tomb at trenzalore ?.
He has been to the one place in the universe he should never go.
12 is suppose to be a darker ,meaner doctor. What if it is just the start of the slippery slope ?.
If Clara dies or leaves him on bad terms it could trigger a breakdown.
Moffat has done a lot of things. Maybe he will give us the last doctor and kill him at trenzalore. Final battle and fall of the - th in the final episode. He dies a final true death. Alternatively he could become a god or just leave it open ended. Regeneration but we don't see the "new" doctors face.

What about the Doctor's Daughter?

Good point would also like to see Jenny come back. 12 would be delgihted to find out she hasd survived and was going round the universe doing work in his name. Fighting terrible creatures, helping people and running a lot.

oohhh that's good, I forgot that it said regeneration not possible

She died. She was shot. End of story.

except she came back to life and left to explore at the end of the episode, so shes out there somewhere

Wasn't the end of the story the fact that she wasn't actually dead?

Even with the wonderful Donna in it, I've not watched this episode for years (not keen on it at all) but I'm sure Jenny is alive!

Edit: Beaten to it. Love Series 4 for the Doctor/Donna combo, but this particular episode...nah. Pretty poor.

I loved that episode and I've wanted to see Jenny back ever since.

No she definitely dies. Shot. Dies in the Doctors arms. Then bam. Fade to black. Definitely how my version of the episode ends.

You must have ended it early, she lives and goes off exploring

Ahhh. I see. Bit of self-editing going on there, methinks.

This is going seriously OT, but with regards to Thrombin's post....love the show, love such varying opinions. Unless The Dominators is your favourite Doctor Who story. That's just wrong.

Me joke.

Maybe Clara can help a little.

Clara- Doctor, I've always wondered why we keep meeting, why I'm in your timestream, why I'm your impossible girl, there was a photo and it was you?
The Doctor- Clara...
Clara - My mum showed me, I kept it in the book, on a page in the book, he was my grandfather but you're not him are you?
The Doctor-The photo Clara, are there others in the photo?
Clara- Yes
The Doctor- Clara, you have just saved the day, this day, the next day and all those days inbetween.

Sorry if I'm being a bit thick but I don't get it

Are you saying Clara is Susan? Or another granddaughter? Either way, how does that help him past his regeneration limit?

This is just an idea of mine.
Possibly another granddaughter A photo of all The Doctors, so that if The Tardis does malfunction for any reason, the photo might reset The Doctor's regenerations by Clara scanning it to The Tardis as the photo could be on special paper printed from a special tree. Does that make sense?

Not in the least but I suspect the real explanation won't either

What if David Tennants doctor in Day of The Doctor isn't Actual 10, or Rose's 10, but an Alternate Universe 10 (Hence hair difference) and has been pulled into Actual 11's timestream for some reason, causing the Day of The Doctor (if it is set in the Time War, this could potentially be a solution to the fact it would be breaking all kinds of paradoxes etc) and at the end of the episode, because of differences between the universes AU 10 can somehow merge with 11 to a) renew some of or all of the Doctors Regenerations [i.e. AU 10's universe he never used The Moment and so can use timelord tech to give The Doctor a new cycle of regenerations yet keep time lords time locked in our universe] b) directly helps shape/create the 12th incarnation.

Probably not much evidence behind it, but it's a nice little theory i thought i'd share

Wasnt it mentioned that during the time war time lords were revived, "to die over and over again". Surely with the Doctor fighting on the frontlines he would be granted a new cycle?

Liking the Amy remembering theory. Just a thought - what about the rebel flesh doctor?

1:25 into this clip is the bit I think you're thinking of

http://www.bbc.co.uk/programmes/p00j4v62

This is only the furthest edge of the time war but at it's heart millions die every second. Lost in blood lust and insanity with time itself resurrecting them to find new ways of dying over and over again - a travesty of life. Isn't it better to end it at last?

Remember - Rule 1!

I think that what will happen is the Dr will capture Mr Bongo, the cosmic monkey. By giving Mr Bongo a damn good spanking, it will release a wave of Unbelievium Energy, which will recharge the Doctor's Gravium Ming-Mong, thereby giving him more regenerations!

Of course, if this idea makes it to the screen, I will be calling the Moff up to demand royalties.