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While examining the paintings, a fissure in time opens above them and the Doctor jumps into it.
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.
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.
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.
She and the Doctor die as the ship crashes on Karn.
The Doctor is resurrected temporarily by the Sisterhood of Karn (who control a secret Elixir of Life in the 1976 serial The Brain of Morbius).
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.