The Lumiat

Missy #2.1
Released: 8 July 2020
If I'm being honest, the Lumiat could just be considered a one-off and not a "proper" incarnation of the Master, as she really only has this one story. But there's technically another one, so here we are. This story explains how Missy survived being "permanently" murdered by the Saxon Master in The Doctor Falls, resulting in a new incarnation who wants to be good. However, the Lumiat's full arc appears in this story, ending with her regeneration, presumably into the Spy Master
Full review to come.