BBC America have released a video featuring interviews with Michelle Gomez (Missy) and Ingrid Oliver (Osgood) - watch it in the player below. As revealed earlier this year, Missy is back for the opening episodes, The Magician's Apprentice / The Witch's Familiar, whilst Osgood returns in the two-part story, Invasion of the Zygons / Inversion of the Zygons.
