In Doctor Who Series 9 what is Missy and Osgood’s deadly relationship?

Michelle Gomez and Ingrid Oliver on Middy killing people including Osgood! So how come Osgood is back?

Doctor Who, Season 9 - Doctor Who UNIT scientist Osgood, played by Ingrid Oliver ©2015 BBC Worldwide
Doctor Who, Season 9 – Doctor Who UNIT scientist Osgood, played by Ingrid Oliver ©2015 BBC Worldwide

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