<P> Missy returns in "The Magician's Apprentice" / "The Witch's Familiar" (2015), revealed to have faked her demise using a teleporter powered by the energy of the Cyberman laser weapon that shot her . She contacts Clara when she believes the Doctor anticipates that he will die, and travels to Skaro with the pair to confront Davros . She helps save the Doctor from Davros' scheme, but fiendishly attempts to trick the Doctor into killing Clara as they escape the crumbling Dalek city . When the Doctor and Clara abandon Missy on Skaro, she encounters a room full of angry Daleks, but informs them that she has a clever plan . </P> <P> Gomez' final series in the role was series 10, airing in 2017 . Early in the series, the Doctor explains to his companion Bill Potts (Pearl Mackie) that he is guarding a vault on Earth as a result of a promise, which is revealed by a flashback in "Extremis" to be a promise to watch over Missy, who is captive in the vault after the Doctor spared her from execution on a faraway world, and Missy promised to become good . In "The Lie of the Land", the Doctor's crew visits Missy in the safe to gain intelligence on an enemy she had defeated in the past . Her demeanour seems little changed and she has low regard for human life, but in the episode's coda, she sheds remorseful tears for all the millions of deaths she has caused . Missy's gradual reform is indicated in several more episodes . In "Empress of Mars", she returns the Doctor's TARDIS to Mars to rescue the Doctor and Bill; in "The Eaters of Light", she has been released from her cage by the Doctor to run repairs on his TARDIS, which is isomorphically locked so that she cannot pilot it . The Doctor attempts to test Missy's reformation in series finale "World Enough and Time" / "The Doctor Falls" by sending Missy, Bill, and Nardole (Matt Lucas) on a rescue mission aboard a space ship experiencing time dilation near a black hole . However, they soon run into Missy's past incarnation aboard the ship, where the Master (John Simm) has initiated the genesis of new Cybermen . Trapped aboard the ship together, Missy finds her loyalties torn between her promise to the Doctor and the lure of her old self . After initially betraying the Doctor, she later chooses to stand alongside him against a Cyberman army, stabbing her past self and sending him back to his TARDIS to regenerate, concluding her life has led to her becoming the Doctor's ally . Enraged at the idea of ever becoming the Doctor's ally, the Master shoots Missy with his laser screwdriver, disabling her regeneration and seemingly killing her . </P> <P> The Master and the Doctor are shown to have similar levels of intelligence, and were classmates on Gallifrey, where the Master outperformed the Doctor . A similar connection between the two was also referenced in The End of Time in which the Master reminisces with the Tenth Doctor about his father's estates on Gallifrey and his childhood with the Doctor before saying "look at us now". In the 2007 episode "Utopia", the Tenth Doctor calls the transformed and disguised Master a genius and shows admiration for his intellect before discovering his true identity . The Tenth Doctor further expresses admiration for the Master's intellect in The End of Time by calling him "stone cold brilliant" and yet states that the Master could be more if he would just give up his desire for domination . The Twelfth Doctor states that Missy is "the one person almost as smart as me" ("The Lie of the Land"). </P> <P> Delgado's portrayal of the Master was that of a suave and charming sociopathic individual, able to be polite and murderous at almost the same time . His design is homage to the classic Svengali character: a black Nehru outfit with a beard and moustache . </P>

How can there be missy and the master