The series follows the fortunes of Dexter, a young prince without a crown, whose King-Father is dead. Soon after that evil wizard Renvick stole the crown and proclaimed himself king. He ordered his servants imprison Dexter for fear that gets in his way. However, Dexter he fled into the woods, where he found the rescue in good magician Phineas, who lived with a young dragon Lulu. When preparing a potion, Dexter unwittingly caused an explosion referring to life three monsters endowed with magical powers - Winkle, Gump and Boo.