After a shape-shifting Zygon imitating Clara fired a rocket at a plane carrying the Doctor and Osgood in the first episode of this two-part story, the pair are forced to make a daring escape this week!



With the rogue Zygons still determined to start a war between their race and humans, the Doctor knows he faces a race against time to save mankind…



The real Clara can help him, but with her trapped in a secret sleeping pod, the Doctor must use all his knowledge of the Zygons to find her before it’s too late!