The Master: ‘My masterpiece, Doctor. A living TARDIS, strong enough to hold the paradox in place, allowing the past and the future to collide in infinite majesty.’
The Doctor: ‘But you're changing history. Not just Earth, the entire universe.’
The Master: ‘I'm a Time Lord. I have that right.’Last of the Time LordsThe flaws of the plan had been so minute that they were easily missed – even by the Doctor. There had been the time when Amy had caught a glimpse of a blonde girl trailing behind a brown overcoat that seemed far too long for the owner. The time when the redheaded woman in the wedding dress was screeching for a taxi in the middle of London, or the time when Amy had ran head first into a woman with a red leather jacket who had no time to apologise. All these small flaws in a grand plan were easily missed.
It is unknown who has stolen the TARDIS, but it has left the Doctor and his companion without a method of escape. The TARDIS has been used to create a Paradox Machine, allowing for past and present to be brought together without instantly destroying the world. This means that two Doctors will meet: one with and one without a TARDIS. As these two worlds collide the crack in time is growing and drawing other planets and beings together. However impossible the situation, they must work together to restore the balance.
Please see a more detailed version of the plot
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aparadox.