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,...

In a future where Earth is covered with water, the human race struggles to survive on dilapidated boats and makeshift floating cities called atolls. When a mysterious drifter/adventurer known as the Mariner gets caught up in the struggle between the evil Deacon and a young girl and her adoptive mother, he finds himself catapulted into an explosive war of good vs. evil.