 The plague kills half of humanity and extinguishes the last vestiges of government.By 1970, the warlord Rudolf (Ralph Richardson), known as the "Boss", has become the chieftain of Everytown and eradicated the pestilence by shooting the infected.He has started yet another war, this time against the "hill people" of the Floss Valley to obtain coal and shale to render into oil so his ragtag collection of prewar planes can fly again.