Planet (An Unearthly Child)

The original home planet of the Doctor and Susan (TV: ) was unclear due to the Doctor's shifting timelines and alterations to their biodata, thus giving the planet many potential identities. (PROSE: ) 
The Doctor's home planet was as distant as a night star, (TV: ) although generally similar to Earth. (TV: ) However, some accounts actually identified the Doctor's home planet as Earth, (PROSE: , ) while many later accounts identified it as Gallifrey. (TV: , , etc.)
Susan, upon travelling with Marco Polo, felt that she had had many homes. (TV: )
== References ==
When Barbara Wright asked if the TARDIS was Susan's home, Susan replied: "yes… well, at least, it's the only home I have now." (PROSE: ) Later in the same conversation, Susan told Ian and Barbara of her and the Doctor's origins, saying "[she] was born in another time, another world". (TV: , PROSE: )
According to one account, the Doctor told Ian Chesterton and Barbara Wright that he and Susan were wanderers who were cut off from their planet and separated from it by millions upon millions of years. Later, Ian wondered if the planet that the Doctor and Susan came from practised customs such as marriage, after contemplating what would happen if Susan would stop travelling in the Tardis in favour of marriage. (PROSE: )
Susan told Ping-Cho that her home was as "far away as a night star", relative to Cathay. (TV: ) Susan later mentioned that her and the Doctor's home planet was similar to Earth, but at night the sky was a burnt orange and the trees had silver leaves; (TV: ) Susan even wished to return to her home eventually. (PROSE: ) Later accounts, however, identified this planet as Gallifrey. (TV: , , etc.)
When Steven Taylor stormed out of the TARDIS after learning that the Doctor did not take an opportunity to spare Anne Chaplet from the St Bartholomew's Day massacre, the Doctor suggested to himself that, having lost so many of his travelling companions, that he should return to his home planet, but acknowledged that he could not. (TV: )
Whilst a prisoner of the Daleks on Skaro during Operation Human Factor, the Second Doctor briefly mused that he could take Jamie McCrimmon, Victoria and Edward Waterfield, and Theodore Maxtible with him to his home planet. At this point, the Daleks believed that the Doctor had become "more than human" as a result of having "travelled too much through time". (TV: )
After the Eighth Doctor made a deal with a boy of Faction Paradox, a memory for a memory, so that the Doctor could locate Griffin, he realised that the boy had not only taken a memory, but altered his biodata. The boy, alongside various versions of himself from the relative future, mocked the Doctor for his shifting past. (PROSE: )
After the Eighth Doctor lost his memories of the Time Lords and Gallifrey, he theorised that he may have been an exile from the forty-ninth century. (PROSE: )
== Other realities ==
In a parallel universe, Martin Bannister was uncertain whether or not to make it explicit that Doctor Who and Susan Who came from Venus in the 49th century. (AUDIO: )
== Behind the scenes ==
The unnamed planet in the 49th century, the home of the Doctor and Susan, was first mentioned in the so-called "The Pilot Episode", where it was explicitly mentioned as the origin of the characters; in the televised episode, this line is less specific.A Brief History of Time Travel: An Unearthly Child on Tony's Musings The First and Second Doctors' eras contained several vague allusions to the Doctor's home, typically inferring that he and Susan were simply humans or humanoids from another planet, until the "Time Lord" backstory was fully established in the serial The War Games and developed significantly in the Third Doctor's era and beyond.
Since then, despite the Doctor having numerous origins being an accepted and oft-mentioned part of the character's backstory, this origin has been very rarely referenced, with the only two references to it outside of the First and Second Doctor's eras being the BBC Eighth Doctor Adventures novels Unnatural History and Escape Velocity (though the planet was referenced in the Doctor Who Unbound audio drama Deadline, which isn't set in the "main" Doctor Who universe), even then only entertaining it as a possibility as opposed to directly confirming it as a backstory. Other stories, such as the novelisation of The Daleks, Doctor Who in an Exciting Adventure with the Daleks, usually play with the general idea, albeit a different take upon it.
One of Anthony Coburn's early scripts would have established that Susan had been a princess on her home planet, which would have been different than Doctor Who's world. Thereafter, Susan was envisioned as a fugitive from the Doctor's home planet. Coburn later altered the character to be the Doctor's granddaughter, to avoid having a biologically unrelated female teenager travelling with an old man.The Tribe of Gum (script), "Doctor Who – The Beginning"
In the 1964 Doctor Who television serial The Sensorites, Susan's description of her home planet was reminiscent of Venus, albeit with a science-fiction spin. However, this planet cannot be Venus as in Marco Polo, which was broadcast earlier in 1964, had Susan explicitly say that her home planet was as far away as a night star. However, Venus being the home of the Doctor and Susan was referenced in the 2003 Big Finish Unbound audio drama Deadline, although this story was set in a parallel universe where the Doctor was only fictional. Regardless, Susan's description of her home planet having orange skies at night with silver trees was later retroactively applied to Gallifrey, becoming part of the well known design as seen in the post-2005 of Doctor Who, although Gallifrey's skies were typically depicted as being orange, even during the day.
In the unaired 1960s audio drama Journey into Time starring Peter Cushing, that version of the Doctor mentions that his civilisation was actually Earth, but three thousand years in Mike's future (who came from the mid-twentieth century).
A behind the scenes note on the Second Doctor had this to say about his origin:
== Footnotes ==
Category:Planets visited by the Doctor
Category:Homes of the Doctor
Category:Homes of the Doctor's companions