Slush Head captures the Scientists of Primus as they are working on repairing the Trithuseum generators. Upon learning that they built the shield around Primus, Skeletor sends them to the Quagmi Swamp in Denebria. He-Man, Hydron, and Flipshot head to Denebria to rescue the Scientists and get them back to Primus to repair the Trithuseum generators before Primus' core overheats.