Over footage of hurricanes and natural disasters, the narrator explains that 'nature's tiniest creations', bacteria, can also kill people. He explains what bacteria are, and how some types can cause disease and poison food. Various types of bacteria are shown. Animations are used to show how bacteria are transferred from one place to another, therefore contaminating food and releasing toxins poisonous to humans. A montage of foodstuffs that are susceptible is shown, in particular, meat, fish and poultry. Flies, cockroaches and mice are shown in a kitchen, and the narrator explains that bacteria can be spread in this way.