The upgrading part is actually cannon. They upgraded them self from the old version as proven in the latest episode. The Doctor falls, episode 12 of season 10.
The Cumbermum! Each occurrence was 10years apart too. That's some good Time Lord shit.
Bugs wasn't THAT bad. Wasn't good, but....
As someone who's appearance looks nothing like the typical "girl", this speaks to me
HE HAD EYEBROWS<<<maybe they were penciled on before? I never payed much attention to his eyebrows until I kept seeing posts about it on here