What is this strange mental world that seems so essential to being human? The conscious mind brings together sensations, perceptions, thoughts and memories to generate the seamless movie of a person's life. It makes us aware of the world around us and our own self. How all this emerges from a kilogram of brain cells is one of the greatest unanswered questions. In leading brain scientists and take you on a journey through the mind to discover what consciousness really is, and what we can learn when it goes awry. Find out if we will ever build conscious machines, what animal consciousness can tell us about being human and explore the enigma of free will.