No spoilers ahead.
I would have run more credits, but the Beeb did this idiocy:
I was going to run two other photos, of the TARDIS, but that would have spoiled. I liked the surprise. I also liked this special.
Moffat again pulled out all the stops and has created an entirely new story arc for the Doctor — cleverly teasing it out of an episode from the prior season and neatly bypassing the WTF of having a Companion from the era of Victorian England.
As for Coleman, she reminds me a lot of Christina Ricci and should bring a different angle to the role of the Companion than Karen Gillan — especially given the twisty time thing Moffat is pulling out of his hat.
There’s a lot of humor in this and an undertone reminiscent of the Doctor under Russell T Davies.