King Randor sends Adam, Cringer and Orko to the Ice Kingdom of Morainia, to collect a powerful energy crystal from his friend King Moraius. However, Skeletor wants the crystal for himself and follows them, capturing King Moraius and demanding that the Royals give him the crystal in return for their King. As He-Man, Adam teams up with the King's daughter, Princess Janis, who helps devise a scheme to rescue her father.King Randor sends Adam, Cringer and Orko to the Ice Kingdom of Morainia, to collect a powerful energy crystal from his friend King Moraius. However, Skeletor wants the crystal for himself and follows them, capturing King Moraius and demanding that the Royals give him the crystal in return for their King. As He-Man, Adam teams up with the King's daughter, Princess Janis, who helps devise a scheme to rescue her father.

A runaway Prince called Glitch from the planet Celasia has joined Skeletor's crew at Snake Mountain, but is so weak and pitiful that he is thrown out violently by Skeletor. The Royal Family take him to the palace to look after him, but Glitch is totally consumed by fear after his ordeal at Snake Mountain. When Glitch's father turns up on Eternia to look for him, and Skeletor attempts to recapture him, He-Man helps Glitch to face his fears.

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!

When Orko finds out that Adam's visiting cousin, Prince Dal, doesn't think Eternos is as magical as his own home kingdom, he gives Prince Dal a pretty rock and tells him that its called the Star Crystal and that it will protect anyone who has it. Prince Dal believes the lie and steals the rock from Orko later to bring to his father, who is fighting a war against the Torks, thinking it will make him invincible.

A small agricultural village is invaded by Space Pirates. When Adam, Teela, Orko and Cringer investigate the village, the Space Pirates steal Adam's sword, leaving him unable to become He-Man. So Adam must take the leading role in his regular identity and convince the villagers to fight back against the Space Pirates, while Cringer sets out to recover the sword.

Merman attacks a seafaring hermit called Jacob with some mechanical sea monsters, but his attack fails and He-Man, Teela and the Widgets rescue Jacob. Merman thinks he could use the Widgets' Coridite to make his mechanical demons stronger, so he sets up a scheme to steal the Coridite. He-Man and his friends must stop Merman, with the help of Jacob.

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?

The Sunstone, which is held within the Temple of the Sun, is running out of power and must be recharged, in The Ceremony of the Sun, which takes place once a century. The Sunstone's keepers invite He-Man and his companions to the ceremony, but on the way they face trouble from Negator, who wants the Sunstone's power for himself, and even more inconveniently a Trollan called Prankster who is deliberately making a nuisance of himself and will only go home if they can guess his name.

Prince Adam, Man-At-Arms and Orko are searching the Vine Jungle for the legendary Stone City- but unbeknownst to them, they are being followed by Evil-Lyn, Webstor and Kobra Khan, who are after the city's treasures. By stealing a map, the villains beat the heroes to Stone City, which is filled with realistic-looking statues. When teleporting a life-bringer machine to Snake Mountain, Evil-Lyn accidentally revives the city's warrior king, Vokan! Vokan reveals that his people have been sleeping in stone for thousands of years, to be awakened when Eternia next needs their help. When he notices the life bringer is missing, Evil-Lyn tells him that it is located in Castle Grayskull. Before long, Vokan himself is attacking Grayskull, unwittingly being used by Evil-Lyn, who wants to gain the castle's powers!

He-Man and company race to recover the Ancient's Book of Spells from it's long-lost hiding place. Skeletor learns of its existence and seeks to take it for himself.

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.

When investigating an ancient temple with Prince Adam, Orko accidentally brings the barbaric King Tamask from Ancient Eternia to the present, with a magical Time Wheel. When he comes across the Royal Palace, Tamask is confused by how it has changed and believes Randor is a magician who has taken over his kingdom. Angrily, he attempts to fight to reclaim the kingdom he thinks has been stolen from him. He-Man must help Tamask see the light, as well as convincing him to turn from his violent ways.

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.

Prince Adam and Cringer crashland in the Misty Swamps when their Wind Raider is attacked by Skeletor's crew. Adam transforms to He-Man and manages to stop them sinking, but he feels weak, poisoned by the swamp water. A boy called Drak and his grandfather find He-Man, and the grandfather decides to transport him along to their village where he can be cured. But Drak, who is tempted by power and wealth, wants to turn He-Man in to Skeletor to gain riches in reward. As they journey to the village, they are pursued by Trap Jaw and Whiplash- will Drak betray He-Man and give him over to the bad guys, or will he see the light and help fend off Skeletor and his minions?

The circus is coming to the kingdom, much to the excitement of Orko, who wants to become a circus performer. Skeletor, enraged that the circus wouldn't come and perform for him at Snake Mountain, sends Evil-Lyn and Beast Man to cause enough ruin to see that it never opens, so that he can take it over himself and be entertained by it whenever he likes...

He-Man meets a blind boy called Lous, whose friends consider him to be helpless just because he is blind. To give him a chance to prove himself, He-Man offers to take Lous on an adventure with himself and Ram Man, to the caves of the Singing Crystal. Lous accompanies them to the caves, but once inside, a flash of light blinds both He-Man and Ram Man. With all three of them blind, Lous uses his senses and bravery to lead them back to safety, across many dangerous obstacles.

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.

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.

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.

As the heroes visit the planet Phantos, Evil-Lyn kidnaps Teela, Man-At-Arms and Orko, and takes them to Snake Mountain, where she shrinks them using a Reducto-Ray. He-Man goes to rescue them, but finds them placed in a trap which will either shrink him or kill them if he uses mere brawn to save them. So he realises he must use his brain to solve the problem- and since Teela has been complaining that Adam is lacking in brain power, he decides to do the job as Adam.