He is 900 years old by the beginning and 1 million years old by the end.

During the production of the first series in 2005, the word "Torchwood", an anagram of "Doctor Who", was been used as a title ruse for the series while filming its first few episodes to ensure they were not intercepted. This title was later repurposed and used as the title of a spin-off series in 2006.

Each IMDb entry lists any alternate titles for discoverability purposes; because "Doctor Who" was known as "Torchwood" at one time, it is listed as a fake working title (in the same way that the IMDb entry for the Star Wars film "The Empire Strikes Back" also lists "Blue Harvest" as an alternate title).

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The Doctor is a Time Lord from the planet Gallifrey. He travels through time and space using a craft called the TARDIS, usually with a companion (or two), averting any crisis he comes across using science, technology, and wit.

As a Time Lord, he has the ability to regenerate, to change his appearance when near death. This mechanism has allowed the show to change lead actor every few years while retaining the same main character.

It is known that he had wives (including Elizabeth I and Melody Pond) and it is widely held that he graduated from the Prydonian Academy and he had a grandchild called Susan, but most other things remains a mystery.

TARDIS stands for Time And Relative Dimension In Space. It is a spacecraft/time machine which the Doctor stole from a repair shop on his home planet of Gallifrey. Because a TARDIS is meant to be piloted by three Time Lords, not one, he does not always control the semi-sentient control system, causing the time travelling capabilities to sometimes go off course. Although it seems too small and cramped for a multi-person spacecraft/time machine, the interior occupies space in another dimension meaning it is bigger on the inside. The exterior became stuck after a component of its cloaking device, the chameleon circuit, was damaged in the first epsiode (An Unearthly Child (1963) 1963) while assuming the shape of a police box to blend in with 1960s Earth. One other thing: the TARDIS is alive, though it cannot communicate with the Doctor in traditional manner, which has been a plot point on a few occasions dating back to 1964, and continuing into the current series. Also if the TARDIS was to land in a place like modern day London it may disguise itself as a modern phone booth. the doctor could fix the chameleon circuit if he wanted to but he likes it as a police box.

It is a continuation of the original Doctor Who (1963) and the 1996 TV Movie Doctor Who: The Movie (1996). Intimate knowledge of the Doctor's past adventures and incarnations is optional and is not needed to understand the current incarnation of the show, however several characters and past doctors are reintroduced and referenced throughout the show's run. A passing familiarity with the eight Doctors who came before doesn't hurt, and the series itself provides the occasional overview of past Doctors.

When a Time Lord is mortally wounded or hurt, they are able to use a process called regeneration. Regeneration is a process in which all the cells in the body are replaced with new ones. The result is a completely new appearance. Since the brain cells are revived, a change in personality usually occurs. Even though the Doctor has changed several times, he still retains the same memories of his previous selves and remains a force for good, even though his priorities sometimes change.

According to the 1976 storyline "The Deadly Assassin" (and since reaffirmed several times in the 1963-89 series and 1996 TV movie), a Time Lord can only regenerate 12 times, for a total of 13 incarnations. However, the 2013 Christmas Special "The Time of the Doctor" changed this so that the Doctor now has 12 more regenerations.

There is a bit of confusion though as the Doctors 2nd 'may' not be classed as a true regeneration as he was not dying it was forced upon him by the timelords as a form of witness protection so he would not be recognised. As in 'Time of the Doctor' we see that they can give regenerations then the second regeneration into Pertwee may not be one of his 12.

Both the first episode of series 1 (Rose) and the first episode of series 5 onwards (The Eleventh Hour) were designed with the purpose of introducing new viewers to the show. These are two of many "jumping in points" created over the years for new viewers, as there are almost no carryover story lines from the original series, and in both instances the whole cast and show runner completely change, creating what is essentially a new show with a new tone.

One can also start from the VERY beginning: the 1963 serial "An Unearthly Child."

The first serial of series 7 "Spearhead from Space" of the original series, also acted as a jumping in point. This was the first story for the Third Doctor, and it is also the first time Doctor Who was aired in colour.

The 2009 specials (which more accurately should be called the 2008-2010 specials) were a series of 5 special episodes produced in lieu of a regular 13-episode series in 2009. Russell T Davies, the producer and head writer, had decided to leave, and David Tennant, the Doctor, had also decided to leave as had committed to a season of performing Shakespeare during the regular series' production window. In order to facilitate the transition between Davies and incoming producer Steven Moffat, it was decided to do a set of specials rather than attempt to cram them into a series. The specials were created to tie up loose threads from the previous 4 years, in order to create a clean start for viewers who wanted to watch the show without having to sit through 4 years of history.

Officially, the specials are considered an extension of series 4 (which is why they are sometimes called the Series 4 Specials). They should be viewed in the order of broadcast: The Next Doctor (1) Planet of the Dead (2) The Waters of Mars (3) The End of Time, Part 1 (4) The End of Time, Part 2 (5). The End of Time is generally considered one story. Of these, the only "optional" special is The Next Doctor, although reference to it is made in the fifth series.

In the middle of the Time War, the Doctor died while attempting to save a pilot who was about to crash into the planet Karn. Revived by the Sisterhood and only having 4 minutes to live, he had the choice of an elixir to force the regeneration into anything he wanted. Having been convinced that he was needed to end the Time War, he chose to be the Doctor no more and become a warrior.

Regenerating into the War Doctor, he set out to end the war once and for all.

According to the Doctor Who Wikia, between "Snakedance" & "Mawdryn Undead".

According to the Doctor Who Wiki...

First Doctor: Between "The Daleks' Master Plan" & "The Five Doctors" & "The Massacre of St Bartholomew's Eve".

Second Doctor: Between "The War Games" ("The Two Doctors") & ("The Five Doctors") "Spearhead from Space" because of his work for the CIA (Celestial Intervention Agency) which delayed his regeneration.

Third Doctor: UNDATED

Fourth Doctor: UNDATED

Fifth Doctor: UNDATED

Sixth Doctor: UNDATED

Seventh Doctor: UNDATED

Eighth Doctor: If all you count is TV, then between Doctor Who: The Movie (1996) & Doctor Who: The Night of the Doctor (2013). However, since the audio adventures are now considered canon, then between "Benny's Story" & "Terror Firma", although, if you count all expanded universe items, then between the short story "For the Man Who Has Everything" & the novel "Alien Bodies".

War Doctor: Technically, after Doctor Who: The Night of the Doctor (2013). If you count the expanded universe, though, then after the novel "Engines of War".

Ninth Doctor: UNDATED

Tenth Doctor: Between "The Waters of Mars" & "The End of Time Part 1"

Twelfth Doctor: UNDATED

No. In the 2008 audio story of Doctor Who: The Companion Chronicles entitled The Catalyst. It was revealed Leela (Louise Jameson) had survived the destruction of Gallifrey and had been captured and imprisoned by a warrior race called the Z'nai and they interrogated Leela for information about the Time Lords. The canonicity of the audio books to the television series has been confirmed due to the 2013 minisode "The Night of the Doctor", in which the Eighth Doctor mentions certain companions such as Charley, Lucie, and Molly just before regenerating. These companions were created in the Big Finish audios.

His name has not been revealed yet. The only people on the show who know his name is his paramour River Song, his companion Clara Oswald, and all of his peers from Gallifrey, including the Master/Missy.

Actress Jodie Whittaker will be taking over the role beginning in the 2017 Christmas special. This marks the first time that the Doctor has been portrayed by a woman. Whittaker is probably best known for her roles in the ITV crime drama Broadchurch and the sci-fi film Attack the Block.