As usual, there have been tons of rumors and lots of wishful thinking about who should replace him.
That move effectively changing the character from The Master to her new name, "Missy", and established that a change of gender during regeneration was possible.
More important is the impact a female Doctor could have on the future. Chances are, this year won't be the year that the series challenges its self-imposed limitations. But is there any possibility that 13 might actually be a former companion?
Whovians, prepare yourselves. The new "Doctor Who" is about to be unveiled.
"If you need to be persuaded to do this part, you're not right for this part, and the part isn't right for you". It's always great though, always giving a sense of character and style. Because to me and my husband, George is an iconic guy.
READ: Can't get enough of Doctors? He had amazing chemistry with everyone he came into contact with. She is best known for playing Beth Latimer for three seasons on Broadchurch. The minimalist set and invisible monster let the writing stand on its own and it's brilliantly effective.
Tennant also had some amazing companions. Whether the Doctor is a man or a woman, the character's values will stay the same.
It is an exciting time and not just for Jodie - female leads have been cropping up with increasing regularity on the big and small screens. Check out this interview with the writer of Doctor Who: The Tenth Doctor!
Jodie will make her debut as Thirteen in the Christmas episode. I mentioned at the top of this article that there would be spoilers, so if you haven't seen series ten then consider this your final warning.
I'm the Doctor. In other words: Run.
But she added: "On live TV a mistake coming out of a woman's mouth is amplified 100 times more than a mistake coming out of a man's mouth".
Except for two breaks, between 1989 and 1996 and 1996 and 2005, the BBC series has been in production since 1963.
They say a hero is only as good as the villain.
We're days away from the official announcement of the thirteenth Doctor, but does it need to be announced at all?
Many fans believe the appointment of a woman would breathe new life into a franchise which has been struggling in the ratings. In the clip, the new mysterious doctor was shown walking through a forest wearing a long hooded jacket.