Doctor Who: Twice Upon a Time (2017)

Introduction and Summary
Doctor Who: Twice Upon a Time is the 2017 Christmas special of the renowned British sci-fi television series, Doctor Who. The episode comes as the conclusion to the tenth series and marks the end of Peter Capaldi's era as the Twelfth Doctor, making it a substantial part of the Doctor Who story arc.

Plot
The story begins on a World War I battlefield where the First Doctor (David Bradley reprising William Hartnell's function) is declining to regenerate, triggering a temporal anomaly. Concurrently, on the South Pole in current time, the Twelfth Doctor (Peter Capaldi) is likewise resisting regeneration. The two Doctors, although the very same person, satisfy through the rift created by their joint refusal to alter.

They are signed up with by the Captain (Mark Gatiss), a British officer frozen in time and nabbed right before his death during the battle. The trio are then gotten by a spaceship coming from Testimony, a company from the future that creates glass avatars of individuals at the minute of their death to preserve their memories.

Testimony and the "Fake" Bill Potts
Inside Testimony's ship, the Doctors encounter a glass avatar of Bill Potts, the Twelfth Doctor's buddy who allegedly passed away earlier. Suspicious, the Doctors flee back to the Twelfth Doctor's TARDIS (Time And Relative Dimension In Space), thinking the Testimony and the avatar are hazards.

Handling the Testimony's Intentions and Returning the Captain
Upon returning to the WWI timeline, the Doctors discover the Testimony's intentions to be harmless. Expense's avatar assists them recognize that the Testimony merely obtains people's memories at their death to permit them to 'live' eternally through their memories. Comprehending this, the Doctors return the Captain to his timeline mere moments after he at first left to pass away.

In a twist of fate, the Captain is exposed to be Archibald Hamish Lethbridge-Stewart, the grandpa of the Doctor's veteran ally, Brigadier Lethbridge-Stewart. And due to time resistance near the South Pole, he lives, permitting the continuation of the essential Lethbridge-Stewart family.

Capaldi's Farewell and Thirteen's Introduction
With all crises avoided, the First Doctor, coming into terms with his choice, restores into the Second Doctor (according to the initial 1966 episode) in his TARDIS. On the other hand, the Twelfth Doctor, after a wholehearted monologue, and offering puzzling advice to his next version, lastly regenerates inside his TARDIS and emerges as the Thirteenth Doctor, represented by Jodie Whittaker, the first woman in this role. She can only exclaim "Oh, dazzling!" prior to the TARDIS, thrown into chaos with the regeneration, ejects her mid-flight, leaving her plummeting towards the Earth, setting the phase for the next series.

Conclusion
Doctor Who: Twice Upon a Time is a tribute to the past and future of Doctor Who, offering a soft and introspective story that paves the way for more development in the series. It brings closure to numerous stories, and marks a significant shift point for the series, concluding Capaldi's period as the Twelfth Doctor and introducing Jodie Whittaker as the Thirteenth and first-ever female Doctor.

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