Skeletor tricks He-Man into thinking he has accidentally killed a man and, consumed by guilt, He-Man transforms back to Adam and drops his sword down the abyss of Grayskull, deciding he is no longer worthy of Grayskull's powers. Skeletor then opens a portal to the goblin world, enabling General Tataran's army to enter Eternia, with possibly enough power and strength to conquer the planet. Can Eternia survive without its greatest hero... and will Adam realize he has been tricked before it is too late?

Skeletor has managed to find the legendary 'Diamond Ray Of Disappearance', a mystical jewel that sends who or whatever it is aimed at vanishing into another dimension. Calling his warriors from around the Universe, Skeletor plans to use the magical gem to get rid of He-Man once-and-for-all. His first victims are King Randor, Queen Marlena, and Man-At-Arms, as well as The Sorceress of Grayskull, and it is up to He-Man to destroy the jewel, freeing his friends from the distant limbo-like dimension that they are trapped in...

Zodac comes to Grayskull and tells The Sorceress that Eternia is in great danger as Skeletor is searching for the Starseed, the single most powerful object in the universe- a small chunk of cosmic matter left over from the big bang, which can turn its holder's thoughts into reality. The Sorceress summons He-Man, and together with Battle Cat and Orko, he sets off on a race to reach the Starseed before Skeletor does. But given that the Starseed is able to give anyone all the power that they want, is even He-Man strong enough to resist being corrupted by its power?

A severe drought has suddenly consumed Planet Eternia, causing plants to die and machines to malfunction- even He-Man himself is weakening. As the oxygen in the air becomes less and less, He-Man sets out to find the cause of the problem. His investigations lead him to the Sea of Eternity, where he teams up with an insect man called Garth to solve the problem- which is being caused by none other than Skeletor, who is using a pumping machine to drain the sea.

A strange little creature called Montiek, a former member of the Council of Evil with Skeletor, turns up at Snake Mountain with some warriors he found on ancient Earth. He is travelling the universe recruiting powerful warriors for his Castle of Heroes, so he can use them as slaves. He has come to Eternia in the hope of capturing He-Man for the Castle of Heroes, and sets up a series of tests which He-Man must pass before he can be recruited. Skeletor is hoping that He-Man will pass the tests, so he can be rid of him- but he knows that He-Man won't be as easy to capture as Montiek thinks.....

Malik, a young wizard living inside Stone Mountain, is leading a lonely life, despairing endlessly over his hopeless love for Teela, who has never returned his interests. He is visited by a repulsive little creature called Locus, with whom he makes a pact in return for Teela. Locus sabotages the dam outside Malik's home, flooding the nearby fields, then he tricks Teela into thinking it was Malik who destroyed the damn, out of love for her. Shocked, Teela journeys to Stone Mountain with He-Man, Battle Cat and Ram Man, to sort out the chaos. Malik, who is under the permanent influence of the evil Locus, captures Teela and attempts to woo her within his fortress. And things turn even worse when Locus' master, Evil itself, arrives to claim Malik's soul.....

Malik, the Wizard of Stone Mountain, calls He-Man and Teela to his aid when the Fountain of Life of Aridan is stolen by the evil wizard Kothos. But just as the heroes confront Kothos in his floating palace, Skeletor sends Evil-Lyn and Clawful after the fountain- and Evil-Lyn ends up stranded in the desert with Teela, her magic wiped away. In spite of their rivalry, Evil-Lyn and Teela have no choice but to work together and form an alliance to get themselves back to safety. As they put aside their differences, they form a surprisingly effective duo- and both learn a thing or two about the other in the process.....

Strange living plants are gradually taking over Eternia. He-Man accuses Skeletor, and Skeletor accuses He-Man, but the real culprit is a curious plant-man called Evilseed, who intends to take over the whole planet with his plants. He-Man and Skeletor must reluctantly combine their powers in order to wither Evilseed's plot...

Now that the House of Shokoti has been risen from the Sands, and Lord Masque has been defeated, the heroes retire to bed for the night, planning to investigate the temple in the morning. But Stanlin, whom Melaktha has refused permission to join the expedition, is determined to see inside the temple for himself, and forces Ram Man (who has been put on night guard) to ram down the temple's door for him. Ram Man gives in to his wishes, but is knocked unconscious by the force of the blow, and Stanlin soon finds himself a helpless prisoner of Shokoti herself.....

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...

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.....

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.

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.

Prince Adam finds his work as He-Man is tiring him out, and Teela is getting frustrated with Adam's apparent laziness, unaware of the real reason for it. After a heated argument between the two of them, Teela decides to make up for it by making Adam train in a fun way, by following her across an obstacle course with a tracking device. Teela runs way ahead of Adam, but runs headfirst into danger as she slips over the edge of Castle Grayskull's abyss and falls down into its bottomless depths. When they realise the possibly fatal situation Teela is in, Adam (as He-Man), Man-At-Arms and The Sorceress must do their best to rescue her before it's too late.

Skeletor captures King Randor, Prince Adam, Teela, Man-At-Arms and Orko, intending to attack the Palace and take over Eternos City. Since Adam is unable to become He-Man when in Skeletor's clutches, only one person is able to save them... Queen Marlena, as pilot of the Rainbow Explorer, the ship which brought her from Earth to Eternia. Using her amazing pilot skills she leads a fleet towards Snake ountain to rescue Skeletor's captives.

Man-At-Arms needs a sample of Rainbow Quartz to repair a frequency transmitter. But the only place where they can find Rainbow Quartz is in a cavern in Snake Mountain! Adam and Cringer have no choice but to venture into Skeletor's domain to find the Quartz- and at the same time, Teela and three students she was training, who have taken a dare, also end up in Skeletor's clutches! With all this unwanted company suddenly invading Snake Mountain, ultimate chaos is sure to ensue!

Man-At-Arms tells Orko the origin of Battle Cat, from how Adam discovered Cringer in the forest as a child, to how Cringer acquired the powers of Grayskull and became Battle Cat.

Orko runs away, thinking his friends don't really like him. The Sorceress solves his problem, but on his way back to the palace he is captured by Skeletor, who puts him under a spell to reveal the riddle of the jaw bridge. Skeletor uses this riddle to break into Grayskull, and The Sorceress must defend the castle while He-Man tries to free Orko.

Skeletor uses a teleportation device to teleport The Sorceress, in the form of Zoar, to another planet. As He-Man and Battle Cat go to this planet to rescue The Sorceress, Teela is given the task of guarding Grayskull in The Sorceress' place. Unaware that someday she will inherit the position of Sorceress for good, will she be able to live up to her destiny?

Orko is visited by his old friend (yes, <I>old</I> friend, in spite of the title) Squunge, from the Academy of Magic on Trolla. Squunge has a knack for telling wild lies and tall tales, and quickly begins to annoy Orko and his friends with this habit. Then Orko winds up being captured by an intergalactic criminal called the Slave Master, scouring the universe for powerful slaves- will Squunge be able to convince the others that he's not lying this time?

An evil dragon called Morning Star hopes to resurrect the age-old war between the dragons and humans on Eternia. He extinguishes the Dragon fire, that powers Granamyr's kingdom, and blames it on the humans. War is declared between the humans and dragons, and He-Man is sent on a mission to recover the dragon fire and put and end to the war.

Man-At-Arms is testing out a new duplicating machine, which can make a replica of any solid object. However, the machine is not yet perfect and so its replicas come out being half the size of the original objects. But Skeletor steals the machine, and he uses it to create a whole army of miniature Skeletors to do his bidding... and before long, the palace is overrun with Skeletors!

Skeletor captures Teela and Orko, and sends them to be imprisoned in the dark, dismal kingdom of Morragor, ruled over by an enslaved monster in thrall to Skeletor. But the monster, despite his gruesome appearance, comes across as noble and friendly, and treats his captives with utmost dignity. As He-Man journeys to rescue his friends, Teela, seeing the monster's true personality beneath the surface, encourages him to break himself free from his unwilling devotion to Skeletor.