James May hosts this look at how the human brain works, using animation and motion graphics to break down what is otherwise invisible: electrical signals firing between neurons, the wiring behind memory, and the physical structures that produce thought and emotion. May visits experts and sits in on demonstrations rather than just narrating over stock footage, asking the kind of basic questions a non-scientist would actually ask about why the brain does what it does. The film covers the organ's basic anatomy, how different regions handle different jobs, and how current neuroscience explains behavior most people take for granted, from decision-making to emotional response. May's presenting style stays light and conversational throughout, aimed at making the material accessible rather than exhaustive. It works best as an entry point into how the brain functions rather than a deep technical survey.