Doctor Who: Every Master Story In The New Series Ranked Worst To Best

For the first half of Series 10, the arc mystery concerned what was lurking in the mysterious vault that the Twelfth Doctor had sworn to guard. And as with her reveal in Series 8, a great deal of Doctor Who fans deduced that it was probably Missy lurking in there and were soon proven right about halfway through the series.

Missy’s presence in Series 10 was not an unwelcome one, however. And her addition to this story raises a complex ethical dilemma.

In the previous episode, companion Bill Potts makes a deal with the mysterious alien Monks to save the Doctor at the cost of Planet Earth’s autonomy. Her and the Doctor return to the vault in this episode, where Missy tells them that that she has encountered the Monks before. She also reveals that the only way to rid Earth of their tyrannical rule is to kill the person who let them in. Bill must die.

When the Doctor assumes that Missy is just being cruel as per usual, she tells the Doctor that his “version of good is not absolute”. Sometimes, tough decisions must be made in the pursuit of universal peace.

This episode offers a great sense of depth and emotion to the Master in a way rarely seen on television before and Gomez plays every moment of it brilliantly.