"A Hero for Earth": Gaia summons Kwame, Wheeler, Linka, Gi, and Ma-Ti and makes them the Planeteers. For their first assignment, they must stop Hoggish Greedly's oil rig operation.
"Rain of Terror": Verminous Skumm attempts to destroy a city with acid rain while Ma-Ti battles self-esteem issues.
"Beast of the Temple": The Planeteers go to Thailand when Greedly starts destructively mining for rubies.
"Skumm Lord": Skumm contaminates the water with a formula that transforms people into rat people like him. Kwame and Ma-Ti must find a cure when the other Planeteers become infected.
"Deadly Ransom": Dr. Blight and Duke Nukem capture Captain Planet and demand a lifetime supply of nuclear waste in exchange for his safety.
"The Conqueror": The evil spirit Zarm corrupts the Planeteers except for Ma-Ti, which renders Gaia mortal. Ma-Ti and Gaia must stop them before they trigger a nuclear war.
"Last of Her Kind": Wheeler learns the true cost of ivory when the Planeteers try to stop Looten Plunder from wiping out the elephant population.
"The Dead Seas": Hoggish Greedly starts overfishing the entire ocean with drift nets. Things get complicated when he manages to steal the Planeteer's rings.
"Tree of Life": Dr. Blight chops down a sacred tree and uses its sap to become even more powerful than Captain Planet, then plans to destroy the ancient redwood forests.
"Volcano's Wrath": Sly Sludge dumps garbage into a volcano, which eventually makes it erupt.
"The Littlest Planeteer": Dr. Blight unleashes a smog monster. Meanwhile, a little boy named Jason is obsessed with becoming a hero and steals Wheeler's ring when he gets injured, unaware he cannot control it.
"A World Below Us": Gi is rescued and taken to a secret underwater city called Oceanus, where its leaders decide to detain her indefinitely to keep the city hidden from the outside world. The city is threatened by Sly Sludge's illegal toxic dumping.
"Plunder Dam": Looten Plunder blocks an African river with a dam to make a hydroelectric plant, but because it was done improperly, the land starts running out of water.
"Meltdown Syndrome": When a nuclear power plant gets a leak, Duke Nukem attacks it, so the Planeteers must stop him before the plant explodes.
"Smog Hog": Hoggish Greedly mass-produces cars that release excessive smog.
"Polluting by Computer": Sly Sludge, Dr. Blight, and MAL hack computers to turn national parks into toxic waste dumps and frame the Planeteers for crimes.
"Don't Drink the Water": Looten Plunder, Dr. Blight, Hoggish Greedly, and Verminous Skumm all team up to contaminate a city's water so they can sell clean water at outrageous prices.
"Kwame's Crisis": After seeing a town apathetic to Sly Sludge dumping garbage all over the place, Kwame decides to quit being a Planeteer.
"Ozone Hole": Duke Nukem starts destroying the ozone layer, letting dangerous UV rays upon the Earth.
"The Ultimate Pollution": Looten Plunder encourages a war between two villages so he can sell weapons to both sides.
"Population Bomb": Wheeler is captured by a race of mouse people who are threatened by overpopulation.
"Mission to Save Earth, Part One": Dr. Blight, Looten Plunder, Duke Nukem, Sly Sludge, and Verminous Skumm steal the Planeteer's rings and leave them stranded on an island guarded by Commander Clash, a soldier who still thinks the Cold War is being waged. The villains create evil duplicates of the rings and combine their powers to create Captain Planet's evil counterpart, Captain Pollution.
"Mission to Save Earth, Part Two": The Planeteers manage to get Commander Clash on their side and they work together to get their rings back and stop Captain Pollution.
"Two Futures, Part One": Wheeler and Dr. Blight are trapped in a cave-in together. Weary of being a Planeteer, Wheeler uses Blight's time machine to go back and stop himself from joining Gaia.
"Two Futures, Part Two": Gaia shows Wheeler the consequences of his actions, as without him, the Planeteers disbanded and Captain Planet doesn't exist, granting the villains victory.
"Heat Wave": Dr. Blight traps Hope Island under a dome and pumps in greenhouse gases, threatening Gaia's life.
Season Two
"Mind Pollution": Verminous Skumm starts selling a highly addictive drug called Bliss, and soon Linka and her cousin Boris are addicted.
"The Garbage Strikes": Sly Sludge steals an untested microbe designed to eat garbage and unleashes it, but it soon goes out of control and grows into a city-threatening monster.
"Domes of Doom": Looten Plunder covers several forests with huge domes so he can sell the fresh air they create to cities that suffer from air pollution without the trees to purify them.
"Send in the Clones": Dr. Blight and Looten Plunder expose a locust and a young boy to a device that causes them to instantly double whenever they eat, threatening the local food supply.
"The Predator": Argos Bleak is hired to eradicate all sharks off the coast of Florida, threatening the ecosystem.
"The Ark": While trying to stop Dr. Blight and Hoggish Greedly from destroying India's rainforests, the Planeteers are abducted by an alien called the Collector, who preserves the last of soon to be extinct species and believes humans fit that category because of the damage to the environment.
"Isle of Solar Energy": Duke Nukem attempts to sabotage a scientist's efforts to revolutionize solar energy.
"The Coral Killer": Hoggish Greedly teaches a Filipino fisherman about dynamite fishing, which he believes will solve his village's food problem, but he doesn't notice that each dynamite blast damages the coral reefs, which makes the island vulnerable to the waves.
"The Big Clam-Up": Ma-Ti becomes addicted to a detective novel and has trouble telling fantasy from reality. Meanwhile, the Planeteers must stop Verminous Skumm from selling tainted seafood.
"An Inside Job": Dr. Blight and Sly Sludge are illegally dumping sewage. Blight betrays Sludge and uses a shrink ray on him and four of the Planeteers. Then Kwame unwittingly drinks them along with contaminated water.
"The Fine Print": Looten Plunder tricks an illiterate worker into spraying a town with deadly pesticides.
"Off Road Hog": Hoggish Greedly and his friend Pete enjoy off-road racing in the desert. The Planeteers show Pete that the so called "barren" desert is actually teaming with life and the damage off-road racing does to it.
"Trouble on the Half Shell": Hoggish Greedly and Verminous Skumm are shipwrecked on the Galapagos Islands and end up introducing rats which start eating the tortoise eggs.
"Stardust": Wheeler insults Gi and Linka's favorite rock singer, Sky Runner, but find he may be right when they discover Sky Runner is helping Hoggish Greedly run a devastating strip-mining operation.
"The Blue Car Line": Looten Plunder makes an Australian transit line appear haunted so he can promote his polluting cars.
"Birds of a Feather": Hoggish Greedly runs an illegal bird smuggling operation in Central America.
"Summit to Save Earth, Part One": Zarm unites Hoggish Greedly, Looten Plunder, Sly Sludge, Duke Nukem, Verminous Skumm, and Dr. Blight under his leadership. Zarm manages to steal the Planeteers' rings and trap Gaia, rapidly aging her.
"Summit to Save Earth, Part Two": Finding themselves ten years in the future and seeing a ruined Earth, the Planeteers reunite with Commander Clash and struggle to defeat Zarm and rescue Gaia.
"Losing Game": Dr. Blight's experiments cause cattle to rampage.
"A Twist of Fate": After an earthquake, Wheeler is separated from the others and suffers amnesia from a blow to the head, becoming a homeless person.
"The Great Tree Heist": Hoggish Greedly uses a fake UFO to suck up ancient trees to turn into furniture.
"Scorched Earth": Zarm possesses a dictator and has him implement a "Scorched Earth" policy against his enemies.
"Hate Canal": Verminous Skumm infects rats in Venice with a deadly disease and they start to spread through the city.
"Radiant Amazon": Sly Sludge and Duke Nukem dump toxic waste in the Amazon rainforest, endangering Ma-Ti's village.
"Fare Thee Whale": Dr. Blight and Looten Plunder are hunting whales and have fooled the authorities into legalizing it by claiming it is for research.
"Utopia": After watching several sci-fi movies, Kwame is shocked to find the Planeteers fighting for survival in a surreal, gang-dominated world ruled by Skumm and Dr. Blight. When the other Planeteers are captured and brainwashed into being gang members, Kwame's only ally is Darian, the leader of Utopia, the last unpolluted refuge on the planet.
Season Three
"Greenhouse Planet": Dr. Blight misleads the President of the US into ignoring the Greenhouse Effect. Blight traps the President, Kwame, and Ma-Ti on a spaceship on a course for Venus, then a mishap leads to Captain Planet lacking most of his powers.
"A Creep from the Deep": A mutated giant squid attacks a small town after Sly Sludge's illegal waste dumping kills its food supply.
"The Deadly Glow": Duke Nukem attacks Korea to search for cesium to absorb. Unfortunately, two children find a piece of cesium and mistake it for a "magic star", leading to their city being contaminated by radiation.
"A Perfect World": The Planeteers are invited to enter a virtual reality world meant to be a paradise, but Dr. Blight takes control and turns it into a nightmare.
"The Dream Machine": Zarm starts selling wishes to a small village. Blinded by greed, they don't notice that each wish drains their natural resources.
"Bitter Waters": Sky Runner asks the Planeteers for help when Looten Plunder tricks his people into selling their land to him.
"The Guinea Pigs": Dr. Blight kidnaps animals for cruel experiments.
"OK at the Gunfight Corral": Hoggish Greedly and Sly Sludge travel back in time to the Wild West to alter history so the Grand Canyon will be turned into a dumping site.
"Canned Hunt": Hoggish Greedly starts a "canned hunt", a hunting party where the animal has no chance of escape, and manages to capture the heroes.
"Hog Tide": Gaia tells the Planeteers a tale from the 1940's of when a past generation of Planeteers helped stop Hoggish Greedly's grandfather Don Porkaloin and Dr. Blight's grandmother Betty from destroying a beach.
"A Formula for Hate": Verminous Skumm spreads lies saying HIV is super contagious and can be spread by casual contact, causing a town to ostracize an HIV-positive young man.
"If It's Doomsday, This Must Be Belfast": Duke Nukem and Verminous Skumm have planted nuclear bombs in three war-torn countries, forcing the Planeteers to split up to try to stop the conflicts and disarm them.
"The Night of the Wolf": Looten Plunder introduces a robotic wolf that begins to attack real wolves.
Season Four
"A Mine Is a Terrible Thing to Waste Part One": While the Planeteers try to stop Sly Sludge and Looten Plunder from dumping toxic waste into a salt mine, Captain Planet battles a resurrected Captain Pollution.
"Wheeler's Ark": While trying to stop one of Looten Plunder's plots, the Planeteers keep bringing animals back to Hope Island, much to Gaia's dismay.
"Sea No Evil": Hoggish Greedly uses dolphins as pawns to recover toxic waste from a sunken submarine.
"Future Shock": Zarm calls villains from the future to ravage the present.
"I've Lost My Mayan": While exploring Mayan ruins, the Planeteers get sent to the distant past where Ma-Ti is swapped with the son of a rebel. Ma-Ti is arrested while the boy sees the future.
"Talkin' Trash": Wheeler returns to his hometown and finds his old friends have joined Verminous Skumm.
"The Energy Vampire": Dr. Blight improves Duke Nukem so he can absorb electricity as well as radiation, so he starts draining cities.
"Bottom Line Green": The Planeteers investigate explosions at a factory.
"Gorillas Will Be Missed": In a distant future where gorillas are extinct, a teen named Goki is transported to the past and reluctantly helps the Planeteers stop Looten Plunder from hunting the gorillas and destroying the rainforest.
"Bug Off": Verminous Skumm creates mutated boll weevils that become stronger when exposed to pesticides.
"You Bet Your Planet": Captain Planet, the Planeteers, and several villains are abducted by aliens and forced to compete on a twisted game show.
"Going Bats, Man": Looten Plunder's nephew, Robin Plunder, films a horror movie about bats, but it makes the town mistake harmless and helpful bats for monsters and attempt to exterminate them.
"Jail House Flock": Captain Planet and the Planeteers try to stop Hoggish Greedly from destroying the wetlands, but get arrested. Captain Planet refuses to break out, but the Planeteers are released only to be framed for escaping and become fugitives.
"High Steaks": Looten Plunder attempts to ruin an environmentally friendly ranch.
"Planeteers Under Glass": The Planeteers enter a virtual reality environment that will simulate the accelerated affects of pollution on the planet, but Dr. Blight locks them in and alters the environment to try to kill them.
"Orangu-Tangle": The Slaughters, a mother and son team of poachers, start hunting and capturing orangutans.
"No Horsing Around": Hoggish Greedly starts illegally hunting horses that live on Native American land.
"'Teers in the 'Hood": The Planeteers go undercover as students to investigate gang violence that ended up catching Gi's friend in the crossfire.
Season Five
"Twilight Ozone": Animals are going blind due to radiation poisoning caused by Duke Nukem.
"Hollywaste": Dr. Blight attempts to sabotage a movie about the Planeteers that stars her good sister, Bambi Blight.
"The Ghost of Porkaloin Past": Hoggish Greedly inherits his grandfather Don Porkaloin's estate. His grandfather's will tells him to use the money to help the environment, but he disobeys, so his butler and the Planeteers try to set him on the straight and narrow path.
"Disoriented Express": Dr. Blight kidnaps a philanthropist who is trying to set up a smog-reducing railway system.
"Horns A' Plenty": Looten Plunder and the Slaughters start hunting rhinos for their horns.
"A River Ran Through It": Hoggish Greedly starts a war between the fishermen and loggers of a small town.
"No Place Like Home": Dr. Blight manages to take away Gaia's powers and strand her among the homeless.
"Little Crop of Horrors": Dr. Blight steals an invention that accelerates plant growth, making a vine grow out of control.
"In Zarm's Way": Zarm places two neighboring children in a simulation where they can shape the world via thought, but whenever the children's feuding parents argue, it influences them to hate each other too.
"No Small Problem": Sly Sludge zaps the Planeteers with a shrink ray and strands them in a garbage dump.
"Numbers Game": Wheeler suddenly finds himself middle-aged in the future. He is married to Linka and has children, but he is shocked because the other Planeteers, Gaia, and Captain Planet no longer care about saving the planet.
"Nothing's Sacred": Verminous Skumm steals a South American artifact.
"Who's Running the Show?": Dr. Blight, Duke Nukem, Verminous Skumm, and Hoggish Greedly hijack a TV station to produce pollution-supporting propaganda.
Season Six
"An Eye for an Eye": Hoggish Greedly starts hunting river dolphins.
"Whoo Gives a Hoot?": The Planeteers attempt to prove to a judge that Looten Plunder is cutting down an old growth forest and endangering animals.
"Frog Day Afternoon": Dr. Blight steals frogs hoping to use their DNA to heal her scar. While pursuing her, Wheeler and Linka are shrunken.
"5-Ring Panda-Monium": The Planeteers attempt to rescue abused animals from the circus.
"A Good Bomb Is Hard to Find": Dr. Blight and her future self travel back in time and attempt to sell a nuclear bomb to Adolf Hitler.
"Twelve Angry Animals": The Planeteers encounter talking supposedly extinct animals who put them on trial for humanity's crimes against animals.
"Dirty Politics": In the future, Hoggish Greedly, Looten Plunder, and Dr. Blight have captured the Planeteers. Blight's good daughter, Betsi Blight, travels back in time and asks the present Planeteers for help.
"One of the Gang": After saving a rich man, the Planeteers are invited to a hotel. When the local police mistake Ma-Ti for riffraff, an upset Ma-Ti wanders and visits the poor community.
"Old Ma River": While visiting India which suffers a mysterious plague, everyone except Wheeler becomes sick, leaving him the only one who can investigate.
"Delta Gone": Looten Plunder and Hoggish Greedly try to destroy the African wetlands with their mining and cattle business.
"Never the Twain Shall Meet": The Planeteers meet Milton, who is attempting to save the Mississippi River. Wheeler and Ma-Ti continuously fantasize about experiencing the Mississippi like Huckleberry Finn and Tom Sawyer did.
"Greed Is the Word": Hoggish Greedly attempts to wipe out the manatees.
"101 Mutations": Dr. Blight starts selling diseased animals.
