The Doctor has returned Mags, formerly of the Psychic Circus, to her native world: Vulpana. Not the savage Vulpana that Mags was taken from, but Vulpana in an earlier era. The Golden Millennium – when the Four Great Wolf Packs, each devoted to one of the planet's four moons, oversaw the height of Vulpanan civilisation. A time when the noblest families of the Vulpanan aristocracy found themselves in need of new blood... A golden age that's about to come to a violent end!