In a mythical land known as Prydain, a young pig-keeper named Taran dreams of becoming a great warrior. Under the care of the wise Dallben, Taran is tasked with looking after Hen Wen, a mysterious pig with the ability to foresee the future. His relatively simple life takes a dramatic turn when he learns that the evil Horned King is searching for the ancient Black Cauldron, a powerful artifact capable of awakening an army of deathless soldiers known as the Cauldron-Born. To prevent this dark power from falling into the wrong hands, Taran must protect Hen Wen at all costs as he embarks on an unexpected journey that thrusts him into the heart of danger and adventure.

Along the way, Taran is joined by a colorful group of companions: Eilonwy, a spirited princess with magical abilities; Fflewddur Fflam, a quirky bard with a magical harp; and Gurgi, a bumbling but endearing creature. Together, they face various challenges and adversaries while traversing through enchanted forests and hostile castles. As they unravel the mystery surrounding the cauldron, they realize that courage and friendship are their most potent weapons against evil. Each character must confront their personal fears and find their true potential as they race against time to stop the Horned King and save Prydain from eternal darkness.