shown, using original footage from "The Tenth Planet". Although the last episode of the 1966 story is one of the missing episodes of Doctor Who, the regeneration sequence was preserved when it was used in a 1973 edition of the children's magazine programme Blue Peter. The final scene of "The Doctor Falls" involving David Bradley was filmed as part of the filming of "Twice Upon a Time" in June 2017. Production for "Twice Upon a Time" started on 12 June 2017, and concluded on 10 July 2017. However, the final scene of the episode, in which Whittaker makes her debut as the Doctor, was not filmed until 19 July. The episode had been reportedly titled "The Doctors", before it was announced at the 2017 San Diego Comic-Con that it would officially be titled "Twice Upon a Time". Broadcast and reception The episode was watched by 5.70 million viewers overnight, making it the fifth most watched programme of the day across all channels. The episode received 7.92 million views overall, and it received an Appreciation Index of 81. In the United States "Twice Upon a Time" was watched by 2.2 million viewers on BBC America. Cinemas "Twice Upon a Time" was released in cinemas in multiple countries, including Brazil on 25 December, Australia and Denmark on 26 December, and the United States and Canada on 27–28 December. The cinema release includes two bonus features: a behind-the-scenes view of the episode, and a special celebrating the tenure of Peter Capaldi as the Doctor and Steven Moffat as showrunner and lead writer. Critical reception "Twice Upon a Time" received generally positive reviews, with praise given to the performances. 88% of 24 critic reviews are positive on Rotten Tomatoes, with an average rating of 7.55/10. The site's consensus reads "Doctor Who: Twice Upon a Time pays gratifying homage to the outgoing Doctor while marking a thoughtful, warm and funny passing of the torch to a new era in the franchise." The episode was a finalist in the category of Best Dramatic Presentation, Short Form for the 2018 Hugo Awards. It was also nominated for Saturn Award for Best Television Presentation. Some commentators have criticised elements of the script such as the depiction of the First Doctor, who is portrayed as displaying a sexist attitude. Moffat said that Hartnell's Doctor was "not progressive. Without being too outrageous I think we have re-created that version of