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When Adam, Prince of the planet Eternia, raises his magic sword he transforms into He-Man (the most powerful man in the universe). With his allies and friends, he battles the evil Skeletor and his minions to protect the secrets of Castle Grayskull.
When Beast Man crashlands by Palace Eternia in one of Skeletor's shuttles, Adam, Teela, Man-At-Arms, Man-E-Faces and Ram Man discover that he was being sent to the Dark Moon of Eternia. Curious as to why Skeletor wanted to send him there, they imprison Beast Man in jail and take the ship up there themselves. Reaching Eternia's Bright Moon, they discover that Eternia's two moons are at war with one another after a resident of the Dark Moon reported seeing the people of the Bright Moon causing severe destruction on the Dark Moon. Knowing that the residents of the Bright Moon are innocent, the heroic warriors realise that Skeletor must be the real cause of the destruction, and so Man-E-Faces disguises himself with a Beast Man costume, and goes to the Dark Moon to spy on Skeletor and his warriors and foil their scheme.
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.
Fisto tells a young boy the story of how he was once a bad guy, terrorizing the forest.
A chess-playing nobleman called Lord Todd, from a far-off land, visits Palace Eternia and instantly charms and astounds the Royal Family with the wonderful gifts he provides them, and his incredible skill at chess. To repay King Randor for allowing him to visit, he offers to take Teela on a tour of his own home- the far-off Castle Star. The two of them depart together. However, things turn disturbing when Man-At-Arms is called to Grayskull by The Sorceress, who tells him that a great evil has arrived on Eternia from another dimension... and it has taken its base nowhere other than Castle Star.....
When Orko messes up several attempts to help his friends prepare for the King and Queen's wedding anniversary, he decides he is useless and runs away from the palace with Cringer. He-Man, Teela and Man-At-Arms begin to search for him, to get him back and convince him that they love him as he is.
Whiplash arrives at the Royal Palace, badly wounded, and asking for help. Skeletor has tried to summon up Sh'Gora, a dreaded creature from another dimension, only to have the being turn on him and imprison him along with Evil Lyn and Trap Jaw. Reluctantly, He-Man and his allies must rescue Skeletor and join forces to stop Sh'Gora taking over Eternia and the powers of Castle Grayskull...
A prehistoric race of Bee People know as the Tychons come back to life, and threaten to steal the food supply of Buzz-Off and his hive. And when Skeletor gets involved, the stakes are raised.
Man-At-Arms almost kills the King and Queen when a device accidentally malfunctions, and fearing his skills are weakening with age, considers resigning from his position. Skeletor takes advantage of the situation by installing an energy bug called Byte into the Royal computers to make all the machinery malfunction. Can He-Man find the cause of the problem before it is too late?
Prince Adam and Melaktha undertake an archaeological expedition of the Temple of the Cats, once occupied by an apparently extinct race of Cat People. They take from the temple an ancient statue, called the Grymalkin. But unknown to them, the Cat People still exist and dwell deep within the temple- and the Grymalkin contains an evil demon imprisoned inside. The Cat People's king sends an agile Catwoman, Kittrina, to recover the statue from the Royal Palace. But at the same time, Skeletor sends his minion Webstor after the statue, and beating Kittrina to it, Webstor takes the statue back to his master, who subsequently frees the demon.....
Dree Elle comes to Eternia to enlist Orko's help, explaining that an ambitious Trollan wizard called Snoob has defeated Uncle Montork and taken his position as head of the Academy of Magic. Since Montork claims to have felt inexplicably weak when fighting Snoob, they suspect unfair play was used. Orko and Dree Elle go to Trolla, followed by He-Man and Battle Cat, and it soon transpires that Snoob is being controlled by Whiplash, who is trying to learn magic in order to impress Skeletor. It is up to He-Man to stop his scheme, with the help of his Trollan friends!
Orko is searching all over the Royal Palace for a book he has bought Prince Adam for his birthday. It soon transpires that not only this book is missing, but every book in the kingdom! The books have been stolen by a villain called Batros, who has hidden them in the Temple of the Sun. As the heroes set out to recover the books, Skeletor sends Beast Man and Trap Jaw out to recruit Batros into his army.
The Sorceress realizes her old enemy Morgoth is attempting to return to Eternia. She decides to make a stand and tells He-Man how her first battle against Morgoth caused her to take up the mantle of Sorceress of Grayskull.
Stratos is exiled from Avion after being accused of sabotaging the kingdom's defense shield. During his next attack, Skeletor manages to steal the Egg of Avion and hides it in the Demon Zone with his ally Whiplash.
An irresponsible junior guard, Philip, fails to notice Whiplash sneaking into the palace grounds to steal the King's Ice Raider. He-Man stops Whiplash just in time, but King Randor relocates Philip to the Eternian Weather Station to improve his responsibilities. Skeletor, determined to get hold of the Ice Raider, consults his agent in the North, Icer, and orders him to take over the Weather Station. Icer has no trouble in taking over, and before long weather disasters are occurring all over Eternia.
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.
Once again, Granamyr asks for He-Man's help. The dragons of Eternia are mysteriously disappearing and Webstor and Kobra Khan seem to be behind it.
Man-At-Arms has built a new dam around the kingdom of Eternos, to block off the Eternian ocean and prevent flooding. However, some of his food ships have gone missing, and while flying over the ocean to investigate, Buzz-Off has noticed a strange volcanic island which is not marked on any map. Adam, Cringer, Orko, Man-At-Arms, Teela and Buzz-Off go to investigate further. It soon turns out that Skeletor is the source of the problem, using a floating island to capture the food ships, planning to starve the Eternians then smash through the dam to flood Randor's kingdom! Can the heroes stop him before he succeeds?
As Prince Adam and Teela attempt to fix a broken-down Attak Trak in the desert, Orko stumbles upon the wizard Kothos, who was transformed into a sand slug by Evil-Lyn in the earlier episode "The Witch and the Warrior". He turns him back to his true form, but has made a mistake as Kothos captures the heroes and offers them to Skeletor in return for his second-in-command, Evil-Lyn, upon whom Kothos is determined to enact revenge.
Squinch the Widget visits Snake Mountain, hoping that Skeletor may be able to help him become bigger and stronger. Evil-Lyn gives him a gift for He-Man, and tells him she will make him big if he delivers it to He-Man. But of course, when he delivers it it turns out to be a trick- the box contains soporific mist which makes He-Man and Battle Cat fall asleep, thus enabling Skeletor to capture them! Realising he has been tricked, Squinch vows to make up for his mistake. But with his small size, is he big or strong enough to rescue Eternia's hero himself?
Teela and Orko are returning from admiring one of the Eternian farmer's bumper crops, when strong tremors suddenly shake the ground and whole crops disappear. Teela is sucked underground with one of the tremors, where she finds herself in the tunnels of an underground community called the Belats. While Orko raises the alarm, the Belat's King, Subternias, who is determined to feed his people no matter what, holds Teela prisoner, and she finds that the Belats are not evil, but are very mistrusting, after being tricked by Skeletor years before...
John Erwin
He-Man / Prince Adam / Ram Man / Beast Man / Whiplash / Webstor / Faker / Granamyr (voice)
Alan Oppenheimer
Skeletor / Battle Cat / Cringer / Man-at-Arms / Mer-Man / Buzz-Off (voice)
Linda Gary
Teela / Evil-Lyn / Queen Marlena / Sorceress of Castle Greyskull (voice)
Lou Scheimer
Orko / King Randor / Stratos / Mekaneck / Man-E-Faces (voice)
Erika Scheimer
Arcadian women (voice)
