Holidaying in the Black Mountains, the children take off on a relaxing pony ride only to be ambushed by a wolf-like creature. With their tour guide unconscious and their ponies lost in the surrounding mist the children are all alone in the wild. Forced to hunt and forage for food they stumble across the mystery of the Mountain of Kings and must use all their ingenuity and courage to escape from the clutches of evil scientist Dr Grunwald and his incredible inventions. (thetvdb.com)