On the island of Mogahl, Looten Plunder and Dr. Blight have teamed up, and Blight's new cloning device will be used to clone workers for Plunder's flamethrower factory. They test it on the first living subject they find - a locust. But before they can capture the other one to test for side effects, it gets away. While searching for it, they come across Vico, a boy of a local village. He becomes the source for cloning workers for the factory. He becomes out of control with cloning when his appetite goes on a rampage, and threatens to wipe out the island. Now, the Planeteers (with the help of Captain Planet) must reverse the effects of the cloning ray, and also stop the locust(s) that have been cloned.

An alien (named Collectore) with good intentions abducts the Planeteers, convinced that the Planet Earth is doomed and decides to collect human specimens and include them in his menegerie of assorted alien life forms. The Planeteers must convince the Alien that Earth can be saved before Dr. Blight and Hoggish Greedly can destroy a forest, permanently eliminating the tiger population....

Sludge and four of the Planeteers learn first hand the terrible effects of untreated sewage when MAL and Dr. Blight shrink the EcoSub (and them) to microscopic size and put them into polluted water that Kwame unwittingly drinks. The Planeteers must battle hideous water-borne parasites in Kwame's body so that he can recover, and restore them to proper size.

As key World leaders come together under one roof to discuss how to best prevent the growing spread of pollution and o-zone damage worldwide, Zarm returns to earth with a plot to snuff out the Planeteers. Calling a meeting of all the eco-warriors greatest foes, Zarm is able to tap into earth's energies and drain the earth itself of all it's resources. Only Gaia stands in his way, but Zarm has a final surprise to ensure she does not become a problem..

Zarm, having disabled Gaia and re-taken his position as spirit of the earth, begins turning the world into little more than a dead husk. With Gaia reduced to an old woman with not much longer to live, the Planeteers and Captain Planet face their greatest threat yet...

The Planeteers return to Kwame's homeland, Africa, to investigate strange happenings with cattle that was reported by his long-time friend and brother figure, Dr. Mabutu. Little do they know, Dr. Blight is there, scheming to convince a tribe leader (also a friend of Mabutu) to allow the injection of a serum that turns bulls into super steers in order to resolve their meat supply woes. Not only does this threaten the condition of the land, via excessive grazing, but the serum causes awkward side effects, which eventually does wear off. The Planeteers, with a hand from Captain Planet, manage to rid the land of Blight and MAL.

The Planeteers are shocked to see a mother whale killed during a whaling expedition engineered by Blight and Plunder. They are even more shocked to learn that it's legal, thanks to a loophole in the international laws that allow whaling for "research." They set out to prove that Blight's research for a "whale repellent" is bogus and are helped by a young Japanese teenager who is trying to dissuade his whaler father from working for the villains.

After watching too many B-rated cyborg and gang movies , Kwame falls asleep. Shortly after, the Planeteers are called to go on a mission, where they're sucked into a freak tornado. They are then attacked by robots and have to eject from the Geo-Cruiser, separating Kwame from the others. Kwame lands into a perfect world where trash is non-existent, and is camouflaged by garbage. Meanwhile, Blight and Skumm have taken over the world with vigilante robots and gangs, and have captured the other Planeteers. They are also turned into gang members, and threaten to reak havoc on the environment. Kwame, with the aid of a new friend, must come up with a way to convince his friends that violence is not in their hearts. Once everything is back on track, the tornado returns, and wakes Kwame from what was a nightmare. He turns on the news, only to discover that gangs and violence are not far from what happened in his dream if it continues....

Frogs around the globe are disappearing at an alarming rate! It appears that the scar on Dr. Blight's face is spreading, and she thinks that a concoction of amphibian DNA will regenerate her skin and restore her girlish glamour. Anybody for a froggy frappe?!?

Using her latest time travel device, Dr. Blight returns from 20 years in the future back to the present to warn HERSELF that the world has become... peaceloving! In a last ditch attempt to restart the Cold War, the two Blights hijack a load of plutonium from dismantled warheads and escape back into the past to sell nuclear bombs to the highest bidder.

It's twenty years in the future, and the Eco-villains are older, but certainly none the wiser. What's worse, they're all running for president, and they've kidnapped the future Planeteers so nothing can be done about it! Will anyone be able to stop the Eco-villains from turning the White House into the Blight House?!?

The Planeteers discover Dr. Blight has been experimenting with puppies at a dog pound she's secretly running. Unsuspecting people, including Wheeler's young cousin are adopting unhealthy dogs and it's up to Captain Planet and the Planeteers to put a stop to Blight.