Medialuna, the little princess, has been bewitched by the powerful witch Gualichu and cannot sleep at night. While everyone else in her kingdom sleeps, Medialuna travels into a world of witches, princesses, monsters and fantastic creatures from legends and myths. She shares with them great deeds and reveals tangled mysteries until dawn. In this episode, Dragon Ferucho threatens Medialuna and her friends. To save the princess, Chacabuco runs toward the river of laughter, trying to mislead the dragon. Weird things begin to happen over the river.