A unicorn, believing herself to be the last, searches for any others of her kind, while avoiding the malevolent Red Bull, the agent believed to have destroyed the rest of her herd. Along the way she is mistaken, ignored, attacked, and absessed about. She finally finds help from a magician named Schmendrick and a knight named Prince Lir.

A young Tristan sees his parents killed by the tyrannical Irish, who ruled over a fractured Britain after the Roman occupation. Tristan is taken in by Marke, who rules one of the British tribes. Tristan grows up to be a young prince and a mighty warrior. He's believed slain in battle and given a royal funeral on a burning boat set out to sea. But the fire goes out and Tristan washes ashore on Ireland, where Isolde, the daughter of the Irish king,...