Bleh...it's all bleh.
I said it before, and I'll say it again; it's time for Moffat to go. He's played all the hands in his deck, and now he's just crutching along on past victories. He has become to Dr Who what William Shatner as a director was to Star Trek.
Anyhow.
There was a timeline in the Tennant era where some aliums made a daughter from his DNA. Cool idea, but they never went anywhere with it. Also...the TARDIS Junkyard was a cool idea...which could be used to explain the presence of another Doctor with her own time box.
So, storyline overlap of midway between two seasons. The actual Doctor vanishes for an entire TV year. His daughter fills in, has her own stories and time box. Chlo? Moretz would be a natural here. She'd go about getting The Doctor back and doing exactly NO TIMEY WIMEY fuck shit. Bow ties are NOT COOL. She kicks the shit out of anyone and anything that stands between her and saving the Doctor.
At some point, the Doctor has a regen, and comes back as The Doctor played by....Emily Blunt. A lot of wut wut wut, and they zoom off to save the universe as Doctors are want to do. Half a season or so of this.
But, this isn't Moffat's universe where every action has exactly no equal and opposite reaction. This is the same universe that left Rose Tyler crying her buck teeth out because they saved the universe, and someone has to get the shaft. The bigger the deed, the bigger the shaft.
Another season of Emily Blunt totally off her rocker because her kid died in a pretty unpleasant way, and she's just fucking shit up left and right.
Then! An old friend comes back. The dame with the robot dog. She drags Emily out of the giant puddle of self pity and piss that she was in, drags her from one end of the universe to show her (Emily Blunt, the Doctor) that her child was alive...just spirited long away to a forgotten place, a long, long time ago.
(Jodie Foster steps in, a tired and much older version of her former self...the youngster played by Chlo? Moretz)
Some hugging..talking, and FOOM! Regen time.
Benedict Cumberbatch as...the Doctor.
Oo ee oo eee.