I have read many times that the reason The Master is now in a female body is he stole it however The Doctor confirmed that Missy had two hearts so if he did he would have somehow have to find a Time Lady to do this.
Another thing is he only stole bodies as he was out of regenerations unless he/she has used hem all up since we last saw The Master --Missy is only the 3rd body in a new regeneration cycle so 9 more regenerations are possible.
Another thing is he only stole bodies as he was out of regenerations unless he/she has used hem all up since we last saw The Master --Missy is only the 3rd body in a new regeneration cycle so 9 more regenerations are possible.



