Karen, Kristel and Josje of K3 are overjoyed that their three nieces come to spend the weekend at their apartments. The joy quickly turns sour because the three girls appear to be spoiled brats. This attracts the attention of chief Angel Manuel. In the Cloud Kingdom, where the angels live, Manuel is the director of the Department of rascals. The children who are little rascal, should stay honest for 24 hour and strictly follow the rules of the Angels Book. Because if they do not, is a very special punishment. Manuel orders his assistant Ture to change the three nieces' character, but he instead takes K3, by mistake. Now they need to behave for 24 hours, a task which reveals itself very difficult.
The most powerful criminals in the world are planning to attack Mega Mindy and make an end to her heroic actions. Miss Volta is the leader and becomes a superhero too. She won't stop until Mega Mindy is defeated..
