Michelle Gomez was frankly brilliant as the Master / Mistress, capturing the love hate relationship that we saw between Delgados Master and the Third Doctor, the trickery and deceit of Anthony Ainleys version and the psychopathy of John Simms. But she also brought her own sense of flair, playing a very Scottish Mistress to Capaldis Scottish Doctor. Frankly it would be a terrible waste if Missy is really dead at the hands of the Brigadier. We can only hope that someone as ingenious as her would have found a way to trick the Doctor one last time by faking her death - perhaps teleporting away and making it look like she had been vaporised. There are still a lot of unanswered questions surrounding Missy and we want answers. Besides Gomez has amazing chemistry with Capaldi and we would love to see more of that in future episodes. Done right, Missy could be the chief villain of the Twelfth Doctors era, making the events of Dark Water / Death In Heaven the tip of the iceberg,