After a foolish blunder lands our roly-poly hero in court, the judge metes out a harsh sentence: 60 days of community service, supervised by the peculiar, eccentric, and utterly madcap Mr. Keen. But when Chubby Chan sneaks into Mr. Keen's forbidden office, he stumbles upon the fantastical and upside-down world of Upsidonia!
In this topsy-turvy land, Chubby Chan befriends A-Tom, an endearing football-shaped creature, and learns of a mission assigned to him by the ominous council known as the Great Assembly - to locate the elusive Great Door to return home. This kickstarts Chubby Chan's bizarre journey, full of peculiar characters such as the geometric R-Aptors, the elusive Shimmeratti, and the enormous Y-Me. Along the journey, he's joined by Bruce, a headstrong boy from his own world who's on his own path to redemption.
But as a sinister plan by the Shimmeratti threatens to obliterate Upsidonia forever, Chubby Chan and Bruce must unite their wits and courage to save this enchanting realm. However, Upsidonia holds more secrets than Chubby Chan could have ever imagined. As reality melds with illusion, Chubby Chan begins to realize that his extraordinary trials are teaching him invaluable lessons about bravery, acceptance, self-belief, and viewing the world from different perspectives.
Can Chubby unravel the mysteries of Upsidonia and find The Great Door before it’s too late? Can he ever return home? Overflowing with imagination and heart, this magical middle-grade adventure set in an ingenious upside-down world explores profound themes of personal growth and redemption amidst a backdrop of humor and fun.