A landslide uncovers an unknown cave in Sherwood, the entrance of which Marion and Much squeeze through to explore. Inside, they feel a sense of unease but find a treasure trove of gold coins and a strange black jewel.

Outside, a dense fog has appeared and a strange eclipse begins to block out the sun. The Merry Men end up being separated from each other but the call of Marion is strong and each of them seem to have an encounter with her. Yet Marion appears intent on making them confront their worst fears. Is she asking them to embrace a greater good, or a bigger evil?

Television series Robin of Sherwood © HTV/Goldcrest Films & Television 1983. Created by Richard Carpenter, with grateful thanks to his Estate.