Re: Missy
"Therefore I'd have expected a later regeneration such as Missy to be less mentally unstable and more like the earlier classic series incarnations of the Master."
Ah but how do we know Missy is a later regeneration? If the Doctor can meet himself from previously in his time stream, why can't he meet a pre-Time War Master? Bet your bottom dollar Moffat's considered that at one time or another.
Biting the hand that feeds IT
