History YMMV / DoctorWhoS36E11WorldEnoughAndTime

** In the week between this and "The Doctor Falls", the question of whether Bill Potts should live or die was a hot topic in fandom since she was now a full-fledged Cyberman, a condition that the Doctor has never been able to reverse. On one side were fans who wanted the revival to see her situation through to the logical bitter end and ''finally'' kill off a long-term companion for good. On the other were those who wanted a bittersweet-but-triumphant ending to her story instead of an undeserved, senseless demise that would be a retread of Danny Pink's in Series 8 and strip her of her agency [[StuffedInTheFridge just to be another tragedy for the Doctor to brood over]] -- one rife with ugly implications to boot, since it would be a black, working class lesbian dying to further the character development of a white, male Time Lord. In the end, she managed to AscendToAHigherPlaneOfExistence thanks to Heather's return, so the latter group "won".

** Being a "Genesis of the Cybermen" story rife with MedicalHorror surrounding the original Cybermen, this story can't help but draw comparisons to "[[Recap/BigFinishDoctorWho034SpareParts Spare Parts]]" and spark arguments over which of the two is the better origin story. Particularly, the Cybermen being created on a colony ship that came from Mondas is somewhat at odds with past tellings of their origins, which claimed they were made on the dying planet itself.[[labelnote:*]]It also calls into question their plan to revitalize Mondas in "The Tenth Planet" if they seemingly left it for dead here.[[/labelnote]] It should be noted that the episode itself goes out of its way to avoid contradicting "Spare Parts", instead acknowledging it and every other Cyberman origin as equally "true", by having the Doctor commenting on how these new Cybermen are a parallel evolution of the race that developed away from other branches, [[ContinuityCavalcade just like on Mondas, Telos, Earth, Marinus and Planet 14]].

** Being a "Genesis of the Cybermen" story rife with MedicalHorror surrounding the original Cybermen, this story can't help but draw comparisons to "[[Recap/BigFinishDoctorWho034SpareParts Spare Parts]]" and spark arguments over which of the two is the better origin story. Particularly, the Cybermen being created on a colony ship that came from Mondas is somewhat at odds with past tellings of their origins, which claimed they were made on the dying planet itself.[[labelnote:*]]It also calls into question their plan to revitalize Mondas in "The Tenth Planet" if they seemingly left it for dead here.[[/labelnote]] It should be noted that the episode itself goes out of its way to avoid contradicting "Spare Parts", instead acknowledging it and every other Cyberman origin as equally as "true", by having the Doctor commenting on how these new Cybermen are a parallel evolution of the race, [[ContinuityCavalcade just like on Mondas, Telos, Earth, Marinus and Planet 14]].

* AlternateCharacterInterpretation: In the week between this episode's debut and that of "The Doctor Falls" there were fans wondering if Saxon-Master actually came to care for Bill over the time she knew him as Mr. Razor, which "The Doctor Falls" reveals to have been ten years, and regretted having to sacrifice her to his plot to both assist in the creation of the Cybermen and stop Missy's HeelFaceTurn. However, "The Doctor Falls" has him telling the Doctor that he ''hated'' having to cozy up to her all that time and he treats Cyber-Bill with the most cruelty of any of the characters, [[ItIsDehumanizing not even referring to her as a she but an it]].

* ContinuityLockout: On the one hand, this two-parter demands not only familiarity with revival series Cybermen ''and'' Master episodes going back to 2006's "Rise of the Cybermen", but draws upon a storyline and characters from ''fifty-one'' years ago ("The Tenth Planet"). Even worse, only three of that serial's four episodes have survived, so anyone born since then is out of luck. On the other hand, much of this story is devoted to revealing the Mondasian Cybermen {{Backstory}} by way of reintroducing these particular villains.

* ContinuityLockout: On the one hand, this two-parter demands not only familiarity with revival series Cybermen ''and'' Master episodes going back to 2006's "Rise of the Cybermen", but draws upon a storyline and characters from ''fifty-one'' years ago ("The Tenth Planet"). On the other hand, much of it is devoted to revealing the Mondasian Cybermen {{Backstory}} by way of reintroducing these particular villains.

** Being a "Genesis of the Cybermen" story rife with MedicalHorror surrounding the original Cybermen, this story can't help but draw comparisons to "[[Recap/BigFinishDoctorWho034SpareParts Spare Parts]]" and spark arguments over which of the two is the better origin story. Particularly, the Cybermen being created on a colony ship that came from Mondas is somewhat at odds with past tellings of their origins, which claimed they were made on the dying planet itself.[[labelnote:*]]It also calls into question their plan to revitalize Mondas in "The Tenth Planet" if they seemingly left it for dead here.[[/labelnote]]

* AlternateCharacterInterpretation: In the week between this episode's debut and that of "The Doctor Falls" there were fans wondering if Saxon!Master actually came to care for Bill over the time she knew him as Mr. Razor, which "The Doctor Falls" reveals to have been ten years, and regretted having to sacrifice her to his plot to both assist in the creation of the Cybermen and stop Missy's HeelFaceTurn. However, "The Doctor Falls" has him telling the Doctor that he ''hated'' having to cozy up to her all that time and he treats Cyber!Bill with the most cruelty of any of the characters, [[ItIsDehumanizing not even referring to her as a she but an it]].

* CriticalDissonance: One of the most highly-regarded episodes of the Twelfth Doctor era by both critics and fans...was also one of the lowest-rated of the entire revival in the U.K., following on from several weeks of ratings lows.