The Doctor Falls

TV Series 10 episode 12

Aired: 1 July 2017

Missy's attempt at rehabilitation collapses completely, as she teams up with the Saxon Master. Whether the whole thing was a sham, or she legitimately regretted, it's hard to say. However, even the Master can't trust the Master, and they end up killing each other. Missy's death is supposedly permanent (but we know better), while the Saxon Master regenerates into...Missy. Probably.