
The gameplay involves large platforming sequences, in which Kyle can run and climb around the environment, find keys and items and progress to the end of each maze like level. The game focuses around protagonist Kyle "Blackthorne" Vlaros, out for revenge on Sarlac and his minions. Sarlac's skull is seen mounted on the wall as a trophy, just as Kyle had promised. The final shot of the game shows him sitting on the throne with a woman sitting next to him. Kyle then becomes king of Androth, where it is stated that he ruled justly, fairly and with honor for many years. He confronts Sarlac and threatens to keep his skull as a mounted trophy on his wall. Kyle ventures through the land fighting his way to Sarlac's castle. The game begins here with Kyle setting out to kill Sarlac and reclaim his throne. He is told that it is time to return to Tuul and save his people. After breaking out of prison facing court martial, Kyle begins having strange dreams, and is eventually confronted by Galadril. Twenty years later, Kyle has become a renowned military captain and mercenary. Vlaros also gives Kyle the lightstone for safe keeping. Knowing of his people's doom, the ruler of Androth, King Vlaros, with the aid of the Androthi magician Galadril, sends his son Kyle to Earth to save his life. He forms an army and leads them against Androth. In this time, a ka'dra named Sarlac seizes power.

But while Androth respects their stone, Ka'dra'suul reject theirs, and are eventually transformed into monsters by it. The people of the lightstone form the kingdom of Androth, and the people of the darkstone form Ka'dra'suul. His body becomes two stones, light and dark, and he gives one to each boy to rule their own kingdoms respectively. Believing it will solve the dilemma, he leads them to the deserts and kills himself. Years before the game begins, Thoros, the latest ruler, finds it near impossible to choose between his two sons as the next ruler. All of this time, Tuul's people have been ruled over by a single shaman who "was blessed with all knowledge".
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Blackthorne is set on the planet Tuul, which has existed for centuries without human knowledge.
