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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.
Other appearances included a very brief glimpse of the then-upcoming Twelfth Doctor (Peter Capaldi), and a guest appearance by Fourth Doctor actor Tom Baker, in his late 70s.
Rounding out the guest cast were Joanna Page as Queen Elizabeth I As the episode celebrates fifty years of the programme, it references and alludes to various concepts featured throughout the show's run.
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.
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.
The episode starred Matt Smith as the Eleventh Doctor and Jenna Coleman as his companion, Clara Oswald.
He reluctantly accepts that with all of reality threatened and the universe "on the brink", there is not much need for a doctor, and chooses a potion designed to initiate his regeneration into a hitherto unknown incarnation of the Doctor as a "warrior" (described in credits as the "War Doctor" and played by John Hurt).
"The Last Day" is filmed from the first-person perspective of a Gallifreyan soldier who has had a camera implanted in his head.
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.