An ancient temple is found within Mount Eternia, and when investigating it, Orko accidentally unleashes The Energy Beast, a powerful electrical demon that once ruled Eternia. He-Man, Man-At-Arms and Teela must drill into the mountain to find the Gold Chamber, which contains the magic needed to control the Energy Beast, before it is too late. But they also face trouble from Skeletor, who is hoping to strike a deal with the Energy Beast himself.

Man-At-Arms has managed to make contact with a peaceful alien being called Om, hovering above Eternia. When Om is being welcomed by the people of Eternos, Skeletor invades the city with General Tataran and the Goblin Army. A fierce battle follows, and Om is confused by the way the two sides fight against one another, as his race knows no violence. So to see which side is wiser and stronger, Om selects He-Man from the side of good, and Skeletor from the side of evil, and pits them against one another in a fight to the finish.

Man-at-Arms stumbles upon a royal trinket that could belong to King Miro, King Randor's long-lost father. With the help of He-Man and Man-at-Arms, Randor journeys to the Swamps of Enchantment in search of his father.

The residents of the small village of Ruckstown are living in permanent fear of a monster they call 'The Tingler' that is said to live on Mount Fear, which overlooks the village. In the hope of hunting down and catching the Tingler, they call Prince Adam and Teela to their aid. Orko and Cringer accompany them, but soon they find themselves captured by the Tingler himself and taken to his home... but once they've got to know him, they find that The Tingler isn't as bad as the locals think...