Meet Billy Robbins – a 19 year old boy who lives with his mother and father and weighs over 800lbs (360 kilograms). Like most teenagers, his life consists of eating, sleeping, watching television and playing video games. However, his size means that he almost never leaves his chair. Unable to take care of himself, Billy has to rely on his mother Barbara who is completely devoted to attending his every want and need. She feeds him, bathes him, cleans up after him, watches television with him and even sleeps in the same room as him. Now Billy has realized that after being fed up to 8,000 calories a day, this Half Ton Teen has to change his diet not only to gain his own independence from his mother, but if he is to live into his twenties.