The Enid Blyton Secret Series 1997 S01E05

Episode: The Secret Mountain. Team up with explorer Thaddeus and four children as they embark on an expedition to discover lost civilisations, challenge a villain's plan to overthrow a king, and foil a crazed scientist's attempt at world domination. After a surprise attack by the inhabitants of the mountain during the night, Thaddeus and Charlotte are taken prisoner. The children begin to question if there is any validity to the native guides' belief that the evil spirits of the mountain are responsible.