This episode explores early science-fiction writers, including Mary Shelley (Frankenstein), Jules Verne (20,000 Leagues Under the Sea) and HG Wells (Things to Come and The Time Machine). Plus, the possibility of nuclear apocalypse, as portrayed in works including Herman Kahn's On Thermonuclear War, Stanley Kubrick's Dr Strangelove, Sidney Lumet's Fail Safe, Nevil Shute's On the Beach and Peter Watkins' The War Game.