Who is this? Who is coming?

The Doctor is autistic.

The Doctor and the Master are definitely divorced.

Five is asthmatic and has some sort of peripheral nerve damage in his legs (because his regeneration almost failed).

Nine wears Fitz Kreiner's leather jacket.

Time Lords are actually eldritch but normal humans can't tell because we can only perceive three dimensions at once.

River Song makes it out of the Library somehow.

The Spy Master first met the Doctor as 'O' when he was Eleven.

Sacha Dhawan plays a character called Reverend Matthew in the audio Ghost Walk, and I like to pretend it's the Master fucking around and being manipulative and shit in disguise. It's very entertaining, especially since a woman in his employ literally calls him Master at one point.

Evelyn knitted Seven's outfit.

Two and Jamie definitely had something going on.

Ood Sigma and hallucination Amy were Ten and Eleven's Watchers, respectively.

Eight is 'like that' (if you know you know) because the anesthesia Seven got delayed regeneration long enough that some of his brain started to die from lack of oxygen, bloodflow, etc etc.

If Survival had been a Sixey episode, he would have had a VERY different reaction to local catboy Master. (I said what I said.)