A new adventure starring the worst witch - lovable but disaster-prone Mildred Hubble.
Mildred makes a wish on a shooting star - and to her great surprise it comes true! Mildred's wish-come-true is a small dog but how can she keep him a secret from all the others, especially the formidable Miss Hardbroom?
It's a disaster waiting to happen...and it does! - but everything turns out for the best when Mildred and her clever dog, Star, win an indoor swimming pool for the school!