"Over the course of just 120 terrifying days, an innocuous seasonal disease mutated into a monster that killed 22 million people around the world – one million more than World War I saw dead by bayonet, shell, gas and machine gun in four years. Scientists estimate that, had the disease maintained its rate of acceleration, it would have wiped out all humankind in months. This program tells the terrible story of the Spanish Flu, whi ..."