Overview
The Black Cauldron is an adventure game designed by Al Lowe of Sierra On-Line and published in 1986. The game is based on the Disney film The Black Cauldron, which was itself based on the Chronicles of Prydain novel of the same name by Lloyd Alexander. It was made shortly after the first King's Quest game, so it resembles that game in many ways. Along with The Dark Crystal it remains one of only a few adventure games by Sierra to be based on films.
Plot
The player character is a young assistant pig-keeper named Taran, who undertakes a quest to stop the evil Horned King, who seeks for Hen Wen, the magical pig of the wizard Dallben, for her visionary abilities. With these abilities, the Horned King would be able to discover the Black Cauldron and rule the land.
Taran's first mission is to lead her to the Fair Folk while the Horned King's dragons are looking for them. Should the pig be captured (the game allows either possibility), Taran can go to the Horned King's castle and rescue her. As soon as he is inside, Taran will meet Princess Eilonwy with her magic bauble and may rescue Fflewddur Fflam, as well as discover a Magic Sword.
From Wikipedia (CC BY-SA 4.0).