The Doctor, Ace and Bernice arrive near a moonbase and meet a woman named Jen Yates; when she asks them if the Human-Earth Reptile war is still being waged, the Doctor seems ill at ease, but to her relief informs her that humanity won. "Jen" recalls that she is actually a soldier named Qurra, who single-handedly killed the station’s human crew; however, one of the humans, a woman named Jen, managed to activate the weapon situated there before she died, killing everyone on the planet below.