In this fun cartoon, they go over the human immune system in a fun and engaging way to teach children the basics of how it all works. The video talks about the immune system and germs with the analogy of a castle as the body and germs as the invaders. It also discusses a little of the science behind a common cold and sore throat and explains it in a way that’s easy to understand. The overall topic is a little more advanced because it dips into some science, but it’s still an amazing resource for kids.