The Golden Rok is stolen by Grok which has the power to control the animals. it falls out of his pouch and into the hands of Li'l Rok who begins experimenting with its abilities.
Mightor has Chief Pondo captured, announces his intention to become chief of all the villages, and make the people his slaves. On their way to rescue their father, Sheera and Li'l Rok run into Tor and tell him what has been happening. Tor is shocked since he is Mightor.
Insect men capture Li'l Rok and Ork when they become lost during a storm. Li'l Rok starts a fire as a distraction when he escapes. Tor sees the flames, changes into Mightor, and goes to help rescue the pair.
Tor and Li'l Rok fly to the village of the Valley people to visit Sherra who's visiting there, but find the place abandoned. As they investigate, Tor is captured by the Stone Men who are using the people to build their stone dinosaur monument.
Sheera and Tor find a note from Li'l Rok saying that he's gone to Dinosaur Island. He wants to be the first villager to capture a dinosaur from there. Knowing he's no match for one of the creatures, Mightor heads for the island.
A boy from the village of the Hill People is looking for Mightor because Kragor and his Cavern Creatures are attacking their village. Li'l Rok says that he is Mightor and leaves with the boy to get rid of the interlopers. Luckily, Tor overhears their plan and follows.
Finding themselves in the Hidden Valley, Li'l Rok is mistaken for a god who's been sent as the villagers' protector. As their leader, he expected to protect them from a creature called the Great White Terror. Mightor wisely has gone to check on Rok.
Super-charged by lightening, the Storm King believes he is now stronger than Mightor. He heads for the village and puts Chief Ponder into a deep sleep when he doesn't hand over Mightor. Tor uses this distraction the change into the powerful hero.
The chief of the Mountain Monsters will name as his successor either Gorg or Brog. Their new leader will be the one who is able to defeat the Mighty Mightor.
The Vulture Men send pterodactyls to bombard the village with boulders. Mightor goes to chase the creatures away, just as the Vulture Men expected. With the village unprotected, the Men attack.
The Witchmen are searching for a queen for their leader when they come across Sheera. They knock her out by burning some "leaves of sleep" and take her back to their king.
While chasing butterflies, Sheera, Li'l Rok, and Tina follow one into a cave. They come out on the other side in a world inhabited by man-eating plants. Lucky for them, Tor had been following behind just in case Mightor might be needed.
To become a hero in his village, Li'l Rok sneaks into the nest of the Terrible Beaked Bird to steal an egg. The Mighty Mightor has to rescue him from the angry creature.
The village's women are kidnapped by Numo and the Sea Slavers while they were repairing the fishing nets. Mightor follows their ships out to sea to rescue the captives.
While exploring, Li'l Rok stumbles across the forbidden Temple of the Scorpion. He's captured by the Scorpion Men, as are Sheera and Bollo. Tor changes into Mightor to rescue them.
Li'l Rok and his friends go rafting down a river to the Black Gorge. Sheera goes after the kids in a canoe because it is too dangerous for them to travel alone. The group runs into one dangerous situation forcing Mightor to repeatedly save them.
Intent on revenge against Mightor, the Serpent Queen has Tor abducted so he can be used as bait. Li'l Rok witnessed the kidnapping and races off with Ork to put the magic club into Tor's hand.
The Ice Creatures intend to take over the land currently occupied by the villagers. Seeing the creatures' glacier being pushed downhill by huge mammoths, Mightor springs into action to save the village.
Tor remains behind while the rest of the village men join Chief Pondo on a hunt. During their absence, Li'l Rok and Sherra are captured by the Cavebearers. Tor changes into Mightor and follows their tracks to attempt a rescue of the pair.
Li'l Rok and Sheera get into a race with Tor while traveling on their rafts down a river. Getting delayed by some rocks, Tor loses sight of his friends who shoot through rapids and land on Vampire Island. Tor realizes that his friends are in trouble and turns himself into Mightor to attempt a rescue.moreless
Sheena is captured by the Stone Men when they invade the village with their stone dragon. Tor offers himself in exchange but the Stone Men hold on to both. Without his magic club, Mightor can not turn into Mightor and save the day.
Taking refuge in a cave during a storm, Tor, Sheera, Li'l Rok and their pets become trapped. Finding another exit, the group emerges in the Valley of the Volcanoes inhabited by Charr and the Fire People. Tor gets caught in a pit while the others are taken to be sacrificed in a volcano.moreless
The Vulture Men are heading to the village to capture Mighty Mightor and entomb him in their Great Stone Vulture to they can gain his powers. Li'l Rock is captured and held as ransom to force Mightor to surrender.
In the jungle, Tor and Li'l Rok hear the cry of the Tree Pygmies. As they beat a hasty retreat, Tor is captured and drops his club. Lil' Rok, Tog, and Ork plot to get the club back into the hand of Tor so he can turn into the Mightor.
Mightor arrives to save Li'l Rok from a dinosaur attack, but finds him missing. He turns up in a nearby village when all the residents have been turned into slaves by giant insect creatures.
Thunder during a snowstorm is said to the voices of the Snow Trappers. Li'l Rok doesn't believe the legend and heads out with Ork to find one of the creatures. One of the Snow Trappers finds Li'l Rok first and captures him. Mightor comes to the rescue.
Kragor and the Cavern Creatures have kidnapped Li'l Rok and Sheera for a sacrifice. Mightor rescues the two from the cave and seals the entrance to their underground lair by triggering a massive landslide.
Sheera goes searching for her missing mammoth cub Bolo and is captured by the Tusk People who already have her pet. Realizing Sheera's missing, Tor and Tog follow her footprints out of the village to find and save her.
Brutor the Barbarian and his army of creatures are headed to the village for an attack and to make slaves of the residents. Mightor warns Brutor to return peacefully to his own land. When he refuses, the mountain erupts and the aggressor is destroyed.
The evil Korg sends a giant ape to kidnap Sheera, using her as bait to lure Mightor and Tog to their doom in the Valley of the Monsters.
The towering creatures who hunt humans show up at Chief Pondo's village and kidnap Tor and Tog.
Grok threaten to destroy the village of the cave dwellers if Mightor refuses to fight his giant Tyrannosaurus Rex. To insure Mightor agrees, he kidnaps Sheera and threatens to toss her into a volcano.
Sheera is kidnapped by one of the Serpent Queen's underlings to be made her slave. After discovering she is missing, Mightor offers to help Pondo find her.
Sheera is captured by the Bird People to be sacrificed into a lava pit. Mightor comes to her rescue, fighting off the giant bird creatures and sealing off the pit.
Tor is captured by the Tiger Men to be sacrificed to their tiger god. Unfortunately, he does not have his powerful club with him.
Exiled Korg returns to the village of the cave dwellers demanding he be named chief. If they refuse, he plans to destroy them by unleashing the beasts of the woods upon them. Mightor defeats Korg and imprisons him on a island to diminish his treat.