Synopsis:

Skeletor has Slush Head take pictures of different areas on Primus. Meanwhile, an ambitious councillor of Primus called Werban is telling the Scientists of Primus that they waste their time with Sebrian's ideas of time travel, just then Sebrian and Mara enter with He-Man and introduce him as the new saviour of Primus. Just then they are informed of an attackby a Mutant fighter on the Oasis, where Drissi and Caz are, He-Man races off to save them.

Slush Head is chasing Caz and Drissi in his mutant fighter when He-Man arrives and saves them, Slush Head spins out of control and return tothe Mutant mothership where he reports to Skeletor and Flogg andSkeletor reveals his plan to destroy the Trithuseum generator onPrimus.

Drissi introduces He-Man to her admiring brother Caz, who soon becomes a new friend of He-Man. Meanwhile, The Mutants send fighters and destroy the Trithuseum generator. The generator requires Trithuseum crystals to function, and without them Primus will overheat, the only place the crystals can be found however, is on the Mutants planet Denebria, in Gorn City.

Hydron and Flipshot unearth an old Starship in Onnor city, which has not been used for some time and they, along with Gleep the robot, go with He-Man to Denebria. They soon discover that Caz has stowed aboardthe ship and when they land on Denebria Caz follows He-Man and Gleep into Gorn City. He-Man locates a one eyed mutant called Meliac who can give him the crystals, and they agree to meet at a mine to exchangegoods.

However, when they try to make the trade, Meliac is revealed as anagent of Skeletor and his henchmen attack He-Man, but he lets Caz and Gleep go because his own son died in a mine shaft cave in. Skeletor then arrives and attempts to punish Meliac for his failure. He-Man intervenes and saves Meliac from Skeletor's wrath, and Meliac quickly abandons Skeletor.

Skeletor attacks He-Man in a rage, and they engage in a battle which ends with Skeletor tumbling down a dark mine shaft. He-Man quickly gathers up the Trithusium crystals and leaves.

He-Man returns to the ship with Caz and Gleep, and Hyrdon and Flipshottells him they have named the new starship after his home planet,Eternia.