Dans ce premier épisode passionnant, le méchant Hoggish Greedly et son acolyte, Rigger, utilisent une plate-forme pétrolière dévastatrice pour exploiter un fieid de pétrole sous les fonds marins. Le désordre est suffisant pour réveiller Gaia, l'esprit de la Terre, de son long sommeil. Elle apprend bientôt avec horreur que les actes impitoyables de Greedly ne sont pas rares dans le monde d'aujourd'hui, la Terre souffrant chaque jour terriblement de toutes sortes de dommages environnementaux. Refusant de s'asseoir et de ne rien faire à nouveau, Gaia appelle cinq jeunes gens spéciaux des cinq coins du globe et leur fournit à chacun des anneaux qui contrôlent les quatre éléments de la Terre, ainsi que le cœur de ses habitants.

Greedly and Rigger strip-mine Thailand for rubies.

Greedly and Rigger plot to empty the oceans of fish.

Greedly creates a pollution-intensive car but his own son becomes a victim of the resulting smog and pollution.

Plunder, Skumm and Greedly pollute the nation's water supply.

A disgruntled Wheeler uses a time machine to travel to the past to stop himself from becoming a Planeteer.

Wheeler's attempt to keep his former self from joining the Planeteers has grave consequences for the planet.

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....

A fishing village is taught a lesson about the coral reef when Hoggish Greedly shows up. He uses dynamite fishing as a cover to rip off the coral reef remains with his new Reef Ripper. The villagers don't see this, as they are now being well fed by a plentiful, but quickly disappearing fish supply. When shown the devastating effects of pounding waves against a neighboring island village, the villagers ask the Planeteers to help stop Greedly. Captain Planet finds a creative way to recycle, and help start a new reef....

Pete, a dirt bike enthusiast, tags along with Hoggish Greedly and Rigger, until Ma-Ti and desert guide Joshua Stone show him how alive the "barren" desert really is. They must get ahead of Greedly's ORV race to save the desert from being destroyed.

The Planeteers are present for the testing of JASON, a robot that observes wildlife and the environment, and transmits the data to its home base. The tests are being done on the Galapagos Islands, which is where Hoggish Greedly, Verminous Skumm and his rats have crash landed, since their ship was thrown off course from a storm. Now, they're hungry, and consider feasting on tortoise eggs to fill their appetites. The Planeteers must fly to the Galapagos to save the eggs, and remove the rats from the environment to restore the balance of its ecosystem.

Gi and Linka are livid when Wheeler belittles their favorite rock singer, but it looks as though Wheeler may be right after they come upon a land-ravaging, strip-mining operation run by Hoggish Greedly, but bankrolled by none other than their idol - Sky Runner! Stunned, they confront the star, who turns out to be innocent, but they still have to stop Greedly before the small mining town is destroyed.

Linka and Ma-Ti visit a friend, Juan, in Central America. While there, Juan's parrot, El Profesor, leads them to a secluded "bird paradise" when suddenly, a giant, metallic bird appears. All the birds, including El Profesor, follow it and so do Linka and Ma-Ti. They soon find themselves locked in a huge aviary, courtesy of Hoggish Greedly, who's running an exotic bird smuggling venture. El Profesor escapes and leads the Planeteers back to the aviary, where they summon Captain Planet, who closes down Greedly's "fly-by-night" operation.

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 travel to the Northwest after hearing about an old growth forest which is, literally, disappearing into thin air. After Wheeler goes off to investigate with a pretty local teenage bird watcher, Linka spots a "flying saucer" but Kwame recognizes the pilot . . . Hoggish Greedly! They discover Greedly's scam - "Sucking up" 500-year-old trees to make pressed board furniture. Outraged, they try to stop him, but his "Tree Trasher" may be too much for them.

Hoggish has set up a new commercial fishing business in the amazon, but when discovers that a group of local river Dolphins are literatly eating into his fishing profits, he schemes to eliminate the problem. Upon being breifed by Gaia, the Planeteers quickly race to make sure the amazon rivers are not made ""Dolphin-Safe"" simply for the sake of progress..

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?!?

Traveling through the lush, African Okavanga Delta on a documentary film-making expedition, the Planeteers come across a makeshift dam, and pipelines which are diverting the life-giving water away from the delta, leaving it a parched desert. In their ultralight planes, the Planeteers and their friend Rick search for the culprits. But when they are shot down by the Eco-villains, it could mean the end of the line for our heroes!

Engines are revving up for a giant speedboat race through the Florida waterways. Unfortunately, the race threatens the endangered manatees who live in these backwaters. As usual, the Planeteers try putting to stop the eco-catastrophe. Only, this time they get some unlikely help from Wheeler's favorite TV stars, Danny Dazzleduff and Belinda Bubblebutt from Babe Watch, when they discover that Hoggish Greedly is behind a plan to get rid of the manatees.