Zombie Earth - S1.E1

Is a zombie apocalypse simply a concept of fiction or could an infectious disease really turn humanity into a race of vicious, seething monsters? National Geographic examines one all-too-real scenario--a pandemic caused by a mutated rabies virus. Experts from the fields of medicine, biology and the social sciences explain what could happen if humanity faced a deadly contagion for which there was no cure--and the truth will shock you.