Chunky is a 10-year-old boy who finds out that he is in danger of becoming obese. With his vivid imagination he confuses what was discussed during his doctor visit and believes he will soon transform into an “O-BEAST.” Can Chunky make sense of it all and stop the O-Beast from taking over? The first book in the series details Charles "Chunky" Spring's visit to the doctor, at which time he is told he is in danger of becoming obese. The story chronicles Chunky’s wild imagination of what it means to be an O-beast and then a final understanding of the definition of the term. Interestingly, each character, while not overweight, has some vice that is addressed with subsequent storylines.