Nameless, spiderlike invaders are killing the vaguely squid-like Culture by inserting their DNA into the Culture and turning them into nurseries for incubation of more invaders. Fearing that the Culture will be destroyed, the Culture attempts to flee what it terms "the homebody" and enter "the overbody." Because he was able to save the Culture, the Doctor feels a renewed sense of purpose. He enters the TARDIS stating that he has "people to see, places to go, things to do." The TARDIS dematerialises and the Doctor heads off for yet another adventure.