Original Airdate: ?/?/1985
Shadow Weaver informs Hordak that Mystic Isle will soon rise, and that the Isle houses the treasure of the First Ones. The island only rises for one day, meaning that time is of the essence. Hordak plans to use the secrets of the treasure against the rebels. Sensing the danger, Light Hope contacts Adora, who transforms into She-Ra to answer his summons to the Crystal Castle.
When she arrives, Light Hope tells her about Mystic Isle. He cautions She-Ra that the treasure of the First Ones must never fall into Horde hands, which may soon happen, as Hordak has stationed a Horde Dreadnought in Octopus Gulf. While She-Ra seeks out help from Sea Hawk, Hordak meets with Octavia and together they sail to the waters where Mystic Isle will soon rise. Sea Hawk and She-Ra follow Hordak's ship, disguised as a cloud, but their disguise is discovered.
Hordak orders the Troopers to fire the plasma cannon at Sea Hawk's ship, causing it to fall. As it crashes, She-Ra is able to leap below to a small island and cushion its fall. Sea Hawk and She-Ra head forward to stop Hordak from reaching the treasures. As the island rises, Hordak travels to the island to discover its treasures.
Sea Hawk and She-Ra encounter a group of Horde Troopers led by Octavia, and a brief skirmish ensues. She-Ra is able to use Octavia's tentacles to spin her into the sea, and together, She-Ra and Sea Hawk continue their mission to stop Hordak. But Hordak is very disappointed by the treasures of the First Ones, consisting of paintings, sculptures, pots, and other priceless artifacts. These are not the weapons that Hordak believed he would find. Since She-Ra prizes these artifacts,
Hordak decides to destroy them, and travels back to the Dreadnought to use his plasma cannon. She-Ra is able to stop him, by tossing a nearby mountaintop into the sea, causing the Dreadnought to capsize onto a reef. She-Ra plans to load the treasures onto Sea Hawk's ship, so that all the people of Etheria can understand the profound aim of the Great Rebellion.
Synopsis by Michael Cravens