The Ratboy Genius tells the story of a dark dream he once had, a dream where he woke up in a place that looked like his kingdom but made from blocks. Upon exploring this strange world he discovers that he's in a dark realm ruled by the cruel and tyrannical ruler, Little king John and that Little King John has kidnapped the Summer Solstice Baby. The Ratboy Genius ventures off into this world with the help of many friends on a long journey to find and rescue the Summer Solstice Baby.