Original Airdate: ?/?/1984
King Randor announces the opening of the Great Eternian Dam, which will create valuable farmland by blocking the Mighty Eternian Ocean. Buzz-Off reports that three of the king's food ships have disappeared in an area with a mysterious volcanic island. Adam and Man-At-Arms investigate, only to find that the island has moved. They are sucked into a whirlpool, below which they find an underground lake housing the lost ships. Skeletor captures them and reveals that he plans to direct his floating island into the Eternian Dam, flooding half the kingdom.
Buzz-Off, Teela, Orko, and Cringer follow a tunnel to the underground, where they find and release Adam and Duncan. Skeletor turns on the island engine and destroys the key, sending the island on course to hit the dam. He-Man pushes over one of the largest pistons, stopping the engine and causing the control area to explode. The king concludes the island shall be used for a wildlife preserve.
Synopsis by Zadoc Angell