A ship crash lands on Quasar with a sole occupant on board. Zanor offers assistance and the passenger turns out to be a Mutoid, a race who can change their appearance to anything. The Mutoids plan to take over Quasar and use it as a base of operations. Zandor destroys the Mutoids' missile control system and the missiles explode, defeating the Mutoids.

The Gladiators of Kyanite arrive and take Tundro for their games. Zandor and Zok go to the rescue as Tundro fights in the arena but must battle their way out. The other Heculoids arrive and defeat the Gladiators but must face the two Champions. They defeat them as well and depart.

While investigating panic among the Monkey People, Zandor confronts a giant spider and is bitten and posioned. Dorno must go the six-legged mustachioed Spider People within the Endless Caves with the Herculoids to get the only known antidote. The Spider People capture Dorno to hold him hostage. The Herculoids eventually stage a rescue, get the antidote, and steal the Spider People's caves to cover their escape.

Quasar is being bombarded from the planet Luvanuum. Zaygot and his henchmen are trying to destroy Quasar. The Herculoids travel to Lubanuum in a stolen ship - when they land their ship is destroyed and they are attacked by winged sentries with deadly laser beams. The Herculoids destroy Zaygot's base and he escapes - they use Zaygot's ship to return to Quasar.

Another alien invader shows up and sends a scout probe out which attacks Igoo when he sees it. Igoo destroys it and Ogron sends out more scout probes. Igoo warns the others who hide when the scouts destroy their tree house, then launch an ambush which destroys the new scouts. The invader agrees to leave if Zandor and Zok defeat Ogron, his champion. After an extended battle Zandor lures Ogron's ship into the Black Pool of tar. Needless to say the alien leader doesn't take it well, breaks his word, and attacks again. Tundro sends him running and Igoo and Gloop shoot a rock that knocks his ship into the Black Pool.

A lightning storm awakens a nest of giant ant eggs. These oversized alien army ants cut a swathe of destruction that Zandor and the Herculoids must put an end to. Eventually the group manages to deflect the path of the ants into a bottomless chasm.

Mekkano the machine is rescued from the intergalactic prison by his automated ship with its electro-smasher and goes to get revenge on Zandor and the Herculoids. He launches waves of attacks with his mecho-tanks and when that fails, his mecho-spheres. Finally he flees to his ship and tries to destroy everyone with his electro-smasher, but Gloop and Gleep manage to capture him and they put him in the automated Prison Rocket back to jail.

The Bubblemen launch an attack in their bubbleships to obtain guiena pigs for their experiments and manage to grab Zandor and Tara. Dorno sneaks into the Bubblemen's underwater city through the whirlpool entrance and he and Gleep free his parents from the leader, Brotac. Zok knocks out some of the pursuing ships, Gloop rescues Zandor and his family when they crash, Igoo and Tundro knock out the remaining ships, and Zok seals the whirlpool entrance once and for all.

Zorvak and the Android People have a duplication machine launch an attack on the Herculoids and capture Zandor to make a super-warrior android. Zandor escapes and they defeat the Android People, but the Zandor super-giant android shows up and kicks some butt. The Herculoids distract it long enough for Zandor to destroy the control unit on its chest. It turns agaisnt its creators and they destroy each other.

A meteor crash lands on Quasar and transforms into a giant crystaline object. Zandor investigates and is attacked by the Crystalites while Tara and Dorno are captured in crystal cells. Zandor, Gloop, and Gleep steal uniforms and sneak into the fortress and free Dorno and Tara. Gloop and Zok destroy Kryton's ship and he is defeated.

After killing two creatures with a treasure chest, pirates bury it on Amzot when the Herculoids approach; Dorno is captured and held hostage.

While Zandor investigates a strange noise, Dorno discovers a field filled with strange pods landing from space. Creatures emerge and try to capture him, Igoo, and Gleep. The other Herculoids arrive and fight them off. Their ship leaves and...the end.

Dorno gets captured by six-legged mustachioed spider men raiders while the Herculoids rescue Tara from similar capture. Zandor and Zok rescue Dorno but the two guys get recaptured by the spider men's adhesive guns. Tara takes the lead and free them. By coordinating they seal off the entrance to the spider men's cave and put an end to the threat for now.

Zandor and Dorno rescue a man floating in the river who says he is from Gravite Island and tells them that a villain has taken over the island. The Herculoids go to investigate and are attacked by giant gravite creatures. The creatures are being created by Lotak who wants the village because of its large deposits of gravite. Zok destroys the machine Lotak uses to make his creatures and Lotak is destroyed when his energy ray backfires on him.

Torrak shrinks the Herculoids, pitting them against his army of warrior microorganisms.

Amak and the Amatons come to the planet and place control collars on some animals. When their efforts to enslave the Herculoids fail, Amak tries to kill them. Gloop and Gleep save the day by turning Amak's stun turret on him, causing his ship to crash.

When a meteor crashes into the nearby swamp, the radiation creates a ferocious monster that the Herculoids must take on and defeat.

A giant vulture captures a Dorgyte and Dorno spots it and calls the others to rescue it. Zok beats the vulture. They escort the Dorgyte through the Stone Forest to safety, but on their return are ambushed by a spike-shooting caterpillar, an armadillo-like creature, and electricity-shooting beetles. The Herculoids prove triumphant and get back to their own valley.

The Herculoids come upon the ruins of a lost civilization - Zandor and Zok leave briefly, and Tara is kidnapped by gargoyle statues that come to life. As the remaining Herculoids are attacked, Zandor returns to help them out and then they must battle with an ancient priest who intends to sacrifice Tara to the largest gargoyle, Trax.

Mekkor and his army of robot invaders lands on Amzot - Mekkor buries himself underground, leaving his antenna above ground to direct his hordes of robot warriors. The robots keep overpowering the Herculoids until Zandor cuts off Mekkor's antenna with his shield - without his control, the robots fall, and break into pieces. Mekkor himself pops back up and Zok blasts him, saving the day.

Queen Skorra unleashes a mud/lava creature which they eventually defeat but Skorra plans to force them into exile by sending her drones to capture Gleep, Gloop, Tara, and Dorno. They defend themselves long enough for Zandor and the others to return and drive off the drones. Skorra launches a mega-shield missile and closes the mega-circle to destroy everyone but Tundro creates a smokescreen while the others make a tunnel to escape and then send Skorra running.

Sta-Lak (then unnamed) flew over Amzot; upon seeing Zandor and Zok, Sta-Lak turned his ship invisible to avoid detection, with the intent of taking Tara prisoner.

Malak sends his Metal Apes to attack the Sea People. Dorno is shot off of Zok by one of the creatures. Zandor and the Herculoids destroy the Metal Apes. A damaged Metal Ape returns to Malak's headquarters and is followed by the Herculoids. The Herculoids destroy the remaining Metal Apes and Zok causes a steel beam to fall on Malak and his assistant.

When Zandor hears a bird shriek he departs without warning and Dorno leads the Herculoids after him. A mole ship is invading the surface and attacks Dorno. Zandor goes after the Mole Men guards guarding the surface entrance in preparation of invasion. Knocking them out, he descends into the depths of the Earth and confronts Markon. Targo, an imprisoned rebel, helps Zandor to escape while Markon pursues. Zandor makes his escape and the Herculoids toss the sentry ship back down the tunnel.

Sta-Lak returns to Quasar seeking vengeance and equipped with robot duplicates of Igoo, Zok, and Tundro. He captures Dorno and Tara and Zandor and the others are forced to go into his volcano lair. The robot duplicates prove no match to the originals even though the robot Igoo can spin at high speeds and has multiple arms, and the mecho-Tundro can fly. Sta-Lak enters a bubble and flees into a volcanic lavahole.

Oton and the Time Creatures are from the future and they want to destroy everything from the past. Oton and the Creatures attack Dorno, Gleep, and Tundro, capturing Dorno and returning with him to the future. Zandor uses Oton's time device to propel himself and the Herculoids 5,000 years in the future. Oton sends his space tanks to destroy the Herculoids but are heroes emerge triumphant. Zandor and the Herculoids rescue Dorno and return to their own time.

The princess Serena of the Sun People arrives on Quasar, being pursued by Darkon of the Faceless People. Darkon wants Serena so he can control her people. The Herculoids successfully drive him off but not before he captures Zara. Zandor agrees to a swap but substitutes a berobed Gleep for Serena and they destroy Darkon's palace from the inside.

The pirate captain and his crew from ""The Pirates"" returns. Using an image transmitter, the captain immobilizes Zandor and the Herculoids and takes Dorno and Tara prisoner. Zok uses his neutralizing eye beams to free them and then Gloop finds the real Dorno and Tara from the transmitted images and the Herculoids launch a new assault. The captain tries to escape and Gloop blocks his escape missile tube, causing the ship to explode.

The story starts with Zandor knocked out by the Laser Lancers and the Herculoids coming to the rescue. Magoth and the Lancers send a new wave of attackers which the Herculoids repel but its a ploy to take Dorno and Tara hostage. With Gleep's help theys eal off the tunnel the Lancers used to sneak up and repel them once and for all.

Sarko the Arkman comes to Quasar to capture specimens and grabs Igoo. The others come running and Sarko gasses Zandor then captures Dorno and Tundro but Gleep escapes to warn the remainder. Tara wakes up Zandor and Zok, Gleep, and Zok head off into space to track down Sarko. Zok frees the captives while Zandor draws Sarko's fire. They beat up Sarko and keep him from dropping Dorno to his death.

Krokaw of the Parrot Men (the Beaked People) plans on taking over Quasar and attacks the flying monkey people to lure Zandor into his trap. Zandor gets captured but Dorno and Zok follow him and Dorno gets captured. Tara and the Herculoids come running as Zandor is sent on a one-way trip down the River of Peril over the Bottomless Falls. Zok frees Zandor and Tundro sends Krokaw over the falls to his (apparent) death.

A new batch of aliens led by Konar use an atmosphere asborber on Quasar while the Herculoids look on. When Zandar and the rest go to investigate the aliens open fire. The Herculoids drive them back but the aliens respond with a gun capable of turning rock to magma. Zandor ""surrenders"" and then they sneak out and shut down the absorber, then fight and defeat the alien zorbots - Konar runs like a bunny.

Volton and his Electrode Men launch an attack on Quasar to vaporize all matter on the planet. Gloop, Zandor, Igoo, and Dorno repel an initial attack and then Volton leads a new attack with more of his forces. He takes Darno and Tara hostage and Zandor leads a night-time attack to free them while Zok breaks a dam and floods Volton's crater-base. Volton flees and the Herculoids prove triumphant for the 33rd time in...oh, about 33 episodes.

Tara is captured by the Reptons, who place her in a mind control device to make them their evil queen. She orders her people to destroy Zandor and the Herculoids, who beat them and go to rescue Tara. The Reptons send the Destructo Bats after them, but they escape, recover Tara and free her from the machine's influence, and destroy the Reptons' underground lair.

Gotron and his Raider Apes attack a nearby village, intent on stealing the people's gold. Summoned by the villagers, the Herculoids arrive nd follow the apes into the cave the gold is hidden in. The villains eventually recover their gold, and load it onto their ship. However, the ship is so weighted down with gold that it can barely move. Zandor sends Zok out with one last bag of loot. The dragon drops it right on Gotron's face, and the ship sinks. The chief of the village reveals that the survivors got away and Zandor suspects that Gotron will one day return.

Torak returns and sends out a giant fly to capture Tara. The Herculoids follow and discover that Torak's warrior microorganisms are now larger and more formidable but defeat them anyway.