A Unicorn living alone in a forest, disturbed at the thought that she may be the last of her kind, sets out to learn what has become of the others of her kind. Seeking clues to their fate, she meets a talking butterfly who tells her of a monster known as the Red Bull who has been hunting all unicorns. Eventually, she befriends the bumbling magician Schmendrick and Molly Grue, the common-law wife of a bandit chief. Together they journey to the castle of King Haggard, where it is said the Red Bull resides.
