Empress of Mars

TV Series 10 episode 9
Aired: 10 June 2017
After a brief appearance in the Vault in The Lie of the Land, Missy gets another small appearance in this story. Nardole needs to let Missy out of the Vault to fly the TARDIS, so he can save the Doctor and Bill. Missy keeps her word, and doesn't take the opportunity to escape.