I don't think it's been mentioned on here but I could be well wrong. It's just a theory I come up with this morning that I thought I'd share.

I think the Tardis crashed into Big Ben at the very start. and exploded. Possibly cracking the clock face of the tower or the bell itself. We have then plunged into some alternate reality timey-wimey stuff while the Tardis repairs itself.

the noise at the end of this teaser may have been a clue
http://www.youtube.com/watch?v=vr_09UALMa0

Or it could be all in my head.

Also the final episode is called The Big Bang. I'm not 100% convinced of this theory myself as we do physically see the Tardis avoid the roof.

The Tardis crashing into a giant clock and the crack it causes being scattered in time seems to work. kind of

Someone else has posted that it's the Tardis that has created the crack and is following the Doctor in order to repair itself (?!)

yeah I think the Tardis causing the crack is a common theory. I think most people think that the incident hasn't occurred yet. my theory is that it has already occurred and involved big ben

To get meta-fictional for a moment, the London flying sequence was tagged on as an extra after the rest of filming was done, apparently. So it's unlikely to be significant.

My theory on crack: Very bad. Just say no, kids.

Or very significant!

I believe the explosion which Causes the Cracks might have something to do with either the Engagement Ring in the Tardis or Amy MEETING Rory from the past when he's not supposed to exist anymore (VIA the Crack possibly Caused by him/Amy) on her formerly intended wedding Day (26/06/10). After all, think about it? How can she or Rory touch the Ring AND it be an Engagment Ring for them to get married when HE is not supposed to exist anymore? In addition, HOW can their love 'last a thousand years' - presumably meaning they still somehow marry on the above date - when Rory's supposed to have NEVER existed?

As you can see, there's quite a few possibilities for paradoxes there, with More than enough to cause one which would destroy, what was it they said happened in Blink if you crossed yourself in time somehow?.......Ah yes, Quite enough potential there to cause a paradox induced explosion that would obliterate Two Thirds of the Known Universe. Either way, I think one out of the Ring OR Rory may just be central to the Whole series plot Arc re the Cracks and Explosion in time. We'll find out soon enough..............

Oh I see.

I kind of thought that having the information in the actual pre-series teaser to solve the story arc would have been the type of thing Moffat might do.

Just out of interest, what's the source of your information?

http://tardis.wikia.com/wiki/The_Ele...ur#Story_notes

Well there is one thing everyone is forgetting about the crack, it appeared way before the Doctor crashes. It appeared on Amy's wall way before the Doctor turns up, so his timeline something must have happened before crashing to cause all of these cracks appearing. We know behind these cracks different things are there (A prison, Earth and a broken burnt Tardis). So they are wormholes leading to past, future etc much like how the Tardis does to travel. It could be the Doctor has caused this during his regeneration or Amy is the key when she remembers Roy, causing a rift starting from the point when the Doctor first crashes (although doesnt explain the crack on her wall appearing before that)

I think you have fallen into the trap of assuming that time is a strict progression of cause to effect but actually from a non linear non subjective view point its more like a big ball of wibbly wobbly timey wimey stuff

I agree with vampirek that Amy is the key to the cracks. They have always appeared around her & its true that the first crack we saw was on her bedroom wall, before the Doctor arrived. The Tardis may be drawn to them, but the Doctor is following the cracks, rather than them following him.

Does anyone know if it's one crack or loads of cracks?

I noticed last week somebody put up a web link of the crack images from different episodes and they were all exactly the same shape....

I'm surprised we haven't had a whole thread full of "Amy's crack" jokes yet!

Its the same crack appearing at different points in time. They are different cracks, but they're all the same shape, caused by the same thing.

Just imagine time as screwed up paper, make a hole with it with a pencil, what do you get? cracks all over time.

The Doctor has explained that this isn't the case - in his own words:

It's when The Doctor, River and Father Octavian have walked away and left Amy with the soldiers. The Doctor is fiddling with his screwdriver, so River asks him what it is, he says that it's the readings from the crack in the wall (the one from FaS, not TEH). She asks him about it, so he says:

"Here's what I think: One day there's gonna [sic] be a very big bang. So big, every moment in history, past and future, will crack."

Amy is the one, earlier in that episode, who claims the crack is following her - she asks 'why is it' and 'how can it be' a few times. This could be where people are getiing that idea from, as she would know a lot less about it than the Doctor.

I'm not sure you're helping me

Think I know what you mean....

Unless it's Amy's crack.

The Doctor could open the Pandorica's box in ep 12 causing the cracks so we have to go back to the future!

I remember seeing an interview with Matt Smith and he said the last 10 mins of episode 11 is the most exciting. So that means the end of 'The Lodger' has a lot of twists and turns...