Elizabeth Estensen played the evil witch T-Bag, in four series that I can remember: "T-Bag Strikes Again", "T-Bag Bounces Back", "Turn on to T-Bag" and "T-Bag and the Revenge of the T-Set". In each, a girl would enter a mysterious shop and be drawn into the world inside an object there (eg. a pop-up book or a music box). She would spend the rest of the series collecting various objects of power (such as silver spoons or brass bells) with which to stop T-Bag taking over the world. Estensen was later replaced as T-Bag by Georgina Hale, who appeared in another four series.