One day, the Pattersons came. They were a weird bunch. All of a sudden, they started devouring our food! What shall we do now? In this planet, there are skirmishes like this every day. These unexpected visitors make us feel weak and indisposed. Being sick can be scary, but our body is ready to jump into action! A fun and colourful journey through our immune system, so we can discover the way our bodies react to bacteria and infections, protecting us every single day — and for the most part, we don't even notice it.