<P> The Eleventh Doctor and Clara Oswald aid the military organisation UNIT, headed by Kate Stewart, in investigating a mystery at the Undergallery, a secret vault housed at the National Gallery . Three - dimensional paintings, made with Time Lord stasis cubes, appear to have been broken from within; the figures previously in the paintings are now missing . While examining the paintings, a fissure in time opens above them and the Doctor jumps into it . </P> <P> In the midst of the Time War between the Time Lords and the Daleks, the War Doctor--a hitherto - unknown incarnation of the Doctor--decides to trigger an ancient weapon called The Moment in order to destroy both sides completely . The Moment is sentient and manifests itself as Rose Tyler . It questions whether mass killing is the best option for ending the Time War and prescribes the Doctor's punishment if he does so--he will survive while the rest of his race dies . The Moment offers to show the Doctor what this will turn him into and opens a fissure linking him to the Tenth and Eleventh Doctors . The three Doctors converge in the year 1562, where the Tenth Doctor has been tracking down a Zygon . They discover that the Zygon is disguised as Queen Elizabeth, who captures and imprisons them in the Tower of London . </P> <P> Meanwhile, within UNIT's Black Archive, Clara learns that the Zygons from Elizabethan England have entered the three - dimensional paintings in the Undergallery and have emerged in 2013, taking the forms of UNIT members so that they could utilise UNIT's weapons and technology . While the three Doctors are in their cell, The Moment encourages the War Doctor to ask them the questions he needs answered before he decides whether to destroy Gallifrey . After a tense exchange, the Doctors devise an escape plan . They then encounter the real Queen Elizabeth and learn through her of the Zygon scheme to conquer Earth . Kate Stewart also learns of the Zygon plan and locks herself in the Black Archive with the Zygons, starting a countdown that will detonate a nuclear warhead underneath the archive . The Doctors, unable to land a TARDIS in the Black Archive, instead use the stasis cube technology to enter a painting . They exit the painting in the present and use the archive's mind - wiping equipment to render the UNIT members and Zygons temporarily unaware which of them are which . The countdown is stopped and all present negotiate a perfectly fair peace treaty, as they no longer know which way to skew it . </P> <P> The War Doctor, now convinced that detonating the Moment will save many more lives in the longer term, is returned to his time by the Moment . The other two Doctors follow him in their TARDISes with the intention of helping him so as to share his burden . After Clara reminds them of their choice of the title "Doctor" and what it stands for, the Doctors devise an alternative solution . They plan to use the stasis technology to freeze the entire planet of Gallifrey in a single moment in time, which would be kept in a pocket universe . When Gallifrey disappears, the surrounding Dalek warships would obliterate themselves in the inevitable crossfire and both species will appear to have been wiped out . Needing more power than three TARDISes for the plan to work, the Eleventh Doctor rallies all his incarnations, including his future twelfth incarnation, to aid him . The Doctors relay their plan to the Time Lords and all thirteen doctors surround and fly towards Gallifrey, which erupts in a bright light . </P>

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