This fantasy for the family, originally produced as a mini series for the BBC, follows three children, Mary, William and Alice, as they spend the summer with Mary's father, who lives in the lush woods of the Golden Valley of Wales.  The children encounter Stephen Tyler, a magician who has mastered the art of traveling through time.   As Tyler attempts to save the rare Golden Badger, whose home in the Golden Valley threatens to be destroyed by greedy property developers, he sends himself back to the 16th century, where he discovers the all-powerful Black Gold.  But the powers of Black Gold are difficult to harness, and when Tyler's assistant, Matthew Morden, gets his hands on the stuff, it nearly puts the valley into the hands of Tyler's enemies.  Based on the popular series of books by William Corlett.