Late 20th Century Earth: the insects rule supreme on a remote Pacific island. Trapped on a beach with the few surviving humans the Doctor can do nothing to fight back.
And if the flies don't get him the Daleks will. Hovering over the planet like vultures, the pepperpot monsters from Skaro recite rousing war-poetry as they plan to forever wrest control of our planet from the tyranny of Emperor Letherbridge-Stewart and his elite UNIT soldiers. As their tactical computers calculate certain victory, their flame-haired Mistress amuses herself with her newest love toy, an insignificant studmuffin named "Adric".
Once again our Doctor and his friends cross the boundary between two Universes and find themselves in that wacky alternate existance with a radically Altered State. But this time the alternate Earth is under more threat than it has ever been before. Can the Doctor solve all its problems and return it to a state of peaceful banality? And even if he can, will he stop the flies from consuming the juiciest fruit of them all... him?
And does he really have sex with Bernice in chapter 12?