Heaven Sent has debuted in Australia, averaging 455,000 viewers in the five major capital cities. The story was the second highest rating ABC drama of the day and the twelfth highest rating program of the day overall. These ratings do not include iview, regional or time-shifted viewers.

Meanwhile, including time-shifted viewers, Sleep No More averaged 564,000 consolidated viewers in the five major capital cities. With 148,000 extra viewers it was the second highest time-shifted program of the day and the twelfth highest rating program of the day overall. These ratings do not include iview or regional viewers.

Face the Raven has debuted in Australia, averaging 481,000 viewers in the five major capital cities. The story, written by Australian screenwriter Sarah Dollard, was the highest rating ABC drama of the day and the eleventh highest rating program of the day overall. These ratings do not include iview, regional or time-shifted viewers.

Meanwhile, including time-shifted viewers, The Zygon Inversion averaged 596,000 consolidated viewers in the five major capital cities. With 130,000 extra viewers it was the third highest time-shifted program of the day and the thirteenth highest rating program of the day overall. These ratings do not include iview or regional viewers.

In 1963 an unassuming science-fiction/fantasy series made its debut on the BBC. Capturing the imagination of some 4.4 million children and adults in the United Kingdom on that dark, late afternoon Saturday, in 2013 the show was officially acknowledged by the Guinness Book of World Records for the simultaneous broadcast in some 94 countries around the world of its fiftieth anniversary special, The Day of the Doctor.

With a single episode broadcast in one country back in 1963, we take a look at what is being shown on 23rd November 2015 (GMT) some fifty-two years later ...

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It won't have escaped fans' notice, but we once again have a current series of Doctor Who airing over the anniversary, and whilst several countries broadcast the latest episode over the weekend, others are at different stages of the run: today it's the turn of YLE2 in Finland, which will be showing Vaikea valinta (aka The Zygon Inversion) this evening. Other channels are repeating episodes, with ABC2 in Australia and BBC Entertainment in Asia showing an encore of Face the Raven, the latter channel and BBC First in the Benelux countries showing Sleep No More, and FX India having an afternoon of Who broadcasting The Magician's Apprentice through to The Zygon Inversion.

In Europe, the Polish and Nordic variants of BBC Entertainment are currently stuck in a "chronic hysteresis", showing Series 6 and 7 episodes for a number of months now. Each episode is shown several times a day, with today's installments being The Almost People and A Good Man Goes to War. The main European channel (also broadcast in the Middle East) is currently showing series seven, with The Rings of Akhaten shown in the early hours of the morning. SyFy in Portugal are also in a "Series 7 loop", beginning again today with O Asilo dos Daleks (aka Asylum of the Daleks).

In the United States, Doctor Who's current "home", BBC America, shows older episodes during the week, with today's broadcasts from Matt Smith's first series, The Vampires of Venice and Amy's Choice. Meanwhile, PBS stations have been broadcasting the previous series over the last few months: for today, Louisiana Public Broadcasting reach the finale, Death in Heaven. Another PBS station, UNC (North Carolina) is currently working through Series 4, today reaching The Sontaran Stratagem and its associated Doctor Who Confidential, Send in the Clones.

TV Cultura in Brazil are also in Series 4, with their weekday broadcasts similarly at O Estratagema Sontaran (aka The Sontaran Stratagem), broadcast in Portuguese.

As well as ABC, Australia also has SyFy which shows a mix of classic and modern Who; today's servings are Kinda part one and Blink respectively (plus The Hand of Fear part one early morning of Tuesday in local time).

BBC Entertainment in Asia also have a regular run of episodes as well as the latest, with today seeing The End of Time: Part One being shown; the channel is also showing Torchwood Declassified, today's being the first episode, Jack's Back.

Jeem in the Middle East is showing Doctor Who Series 8 at the weekends, with The Sarah Jane Adventures on weekday evenings - for today it's the first episode of The Mark of the Berserker. Episodes are shown in Arabic.

Last but not least is the British stalwart of the classic series, Horror Channel, which today embarks upon either the Jon Pertwee swansong Planet of the Spiders or a 'repeat' of Planet of the Daleks from a couple of weeka ago depending on sources!

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In summary, fifty-two years since a single episode was broadcast, there are 22 different episodes of Doctor Who on air today (including all ten of the current series starring Peter Capaldi), which are being shown in some 73 countries around the world (country count based on channels' availability listings).

Full details on broadcasts of the series around the world can be found via the This Week in Doctor Who website, with regular updates on Facebook.

The BBC has confirmed that the final two episodes of Series 9, Heaven Sent / Hell Bent will both run in extended timeslots.

The penultimate episode Heaven Sent will run for 55 minutes and has been confirmed for transmission at 8.05pm on BBC One on 28th November.

The series finale Hell Bent will then run in a 65 minute timeslot starting at 8pm on 5th December.

The two episodes will deal with the consequences of Episode Ten, Face the Raven, which can be seen this weekend.

Sleep No More has debuted in Australia, averaging 506,000 viewers in the five major capital cities. It was the highest rating ABC drama of the day and the thirteenth highest rating program of the day overall. These ratings do not include iview, regional or time-shifted viewers. The program commenced 20 minutes later than scheduled due to extended news coverage of the recent events in Paris.

Meanwhile, including time-shifted viewers, The Zygon Invasion averaged 593,000 consolidated viewers in the five major capital cities. With 163,000 extra viewers it was the highest time-shifted program of the day and the tenth highest rating program of the day overall. These ratings do not include iview or regional viewers.

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Doctor Who series seven is currently being shown on Syfy in Portugal, and series eight (plus 'classic' stories and Torchwood) is airing in Australia. The series has also been broadcast previously by regional channels in Spain and the Netherlands, with Torchwood being shown in Germany and France.

You can keep up to date with broadcasts from around the world via This Week in Doctor Who

The Zygon Inversion has debuted in Australia, averaging 466,000 viewers in the five major capital cities. It was the highest rating ABC drama of the day and the sixteenth highest rating program of the day overall. These ratings do not include iview, regional or time-shifted viewers.

Meanwhile, including time-shifted viewers, The Woman Who Lived averaged 647,000 consolidated viewers in the five major capital cities. With 151,000 extra viewers it was the third highest time-shifted program of the day (the highest time-shifted program had an extra 168,000 viewers) and the ninth highest rating program of the day overall. These ratings do not include iview or regional viewers.

The Zygon Invasion has debuted in Australia, averaging 430,000 viewers in the five major capital cities. It was the highest rating ABC drama of the day and the thirteenth highest rating program of the day overall. These ratings do not include iview, regional or time-shifted viewers.

Meanwhile, including time-shifted viewers, The Girl Who Died averaged 644,000 consolidated viewers in the five major capital cities. With 149,000 extra viewers, it was, with Quantico, the equal highest time-shifted program of the day (the third highest time-shifted program had an extra 131,000 viewers) and the tenth highest rating program of the day overall. These ratings do not include iview or regional viewers.

The Woman Who Lived has debuted in Australia, averaging 493,000 viewers in the five major capital cities. It was the highest rating ABC drama of the day and the thirteenth highest rating program of the day overall. These ratings do not include iview, regional or time-shifted viewers.

Meanwhile, including time-shifted viewers, Before the Flood averaged 660,000 consolidated viewers in the five major capital cities. With 152,000 extra viewers, it was the highest time-shifted program of the day (the second highest time-shifted program had an extra 134,000 viewers) and the fifteenth highest rating program of the day overall. These ratings do not include iview or regional viewers.

The Girl Who Died has debuted in Australia, averaging 501,000 viewers in the five major capital cities. It was the second-highest rating ABC drama of the day and the thirteenth highest rating program of the day overall. These ratings do not include regional or time-shifted viewers.

Meanwhile, including time-shifted viewers, Under the Lake averaged 612,000 consolidated viewers in the five major capital cities. With 182,000 extra viewers, it was the highest time-shifted program of the day (the second highest time-shifted program only had an extra 95,000 viewers) and the eighth highest rating program of the day overall. These ratings do not include regional viewers.