After a puppy adopted by Wheeler's young cousin dies, the Planeteers discover a puppy mill run by Dr. Blight that sells sick dogs.
The Planeteers need Captain Planet's help to stop speeding boaters and Hoggish Greedly from driving endangered manatees out of their habitat.
The Planeteers and their friend Milton explore preservation efforts along the Mississippi River.
The Planeteers must stop Looten Plunder and Hoggish Greedly's destructive mining and cattle rustling ventures in the African wetlands.
On a mission in India, the Planeteers contract a sickness afflicting the locals, and only Wheeler remains healthy enough to find the cause of the illness.
The Planeteers stay at a rich man's upscale hotel, but when staff treats Ma-Ti like a street thug, he heads off on his own to investigate life among the local lower-class community.
Dr. Blight's daughter uses time travel to help the Planeteers stop her mother from being elected the next U.S. president.
When a blizzard traps the Planeteers on Mount Everest, a group of talking animals comes to their rescue, but then puts them on trial for humanity's destruction of Earth's ecosystems.
The Planeteers must stop Dr. Blight from selling a nuclear bomb to an evil dictator.
The Planeteers join the circus as a ruse to save the animals from the horrid conditions.
Dr. Blight poaches frogs from their habitat.
The Planeteers must save old-growth trees from being felled.
The Planeteers discover Hoggish Greedly plans to kill all of the river dolphins in existence.
The eco-villains crash an environmental TV show to replace it with programming dedicated to pollution; the Planeteers attempt to stop their broadcast, but Duke Nukem threatens to detonate a nuclear bomb live on camera.
The Planeteers must retrieve a stolen South American artifact from Verminous Skumm.
Wheeler falls asleep while riding through the Tunnel of Love with Linka and wakes up to find himself older and married with children, and learns his team has lost all hope of saving the planet from the booming population's overconsumption.
Sly Sludge uses a shrink ray to reduce the Planeteers and strand them in a garbage dump.
Zarm forces Gi to save the lives of two children.
Dr. Blight steals an experimental ray designed to help plants grow faster, hoping to secure fame among the scientific community, but her abuse of the invention causes a vine to grow dangerously out of control and the Planeteers must set things right.
When Dr. Blight uses a new invention to take away Gaia's powers, the Planeteers and a powerless Captain Planet must find Gaia and return her to Hope Island before the Earth loses its spirit forever.
The Planeteers answer a call from the Pacific Northwest, where Hoggish Greedly's logging project threatens to destroy a river and ignites a bitter feud between local loggers and fishermen.
The Slaughters and Looten Plunder compete for a monopoly on the black market rhino horn trade, hunting the rhino to the edge of extinction.
The Planeteers must call upon Captain Planet when Dr. Blight kidnaps Ella Salvador, a philanthropist heading up the construction of a new railway network designed to cut down on smog in South America.
Hoggish Greedly inherits his grandfather's estate and selfishly spends his new fortune against the terms of the will, which requires the money be used for environmentally-friendly projects; the Planeteers come up with a plan to change Greedly's ways.
Dr. Blight tries to sabotage her sister's environmentally friendly film shoot by kidnapping her and taking her place, but her sister escapes and warns the Planeteers.
While investigating an outbreak of blindness in South American sheep, the Planeteers uncover a scheme by Duke Nukem and summon Captain Planet to stop him, but Nukem reveals a new weapon that takes down the Captain.
Gi's friend, a teacher named David King, takes a bullet during a gang war and the Planeteers arrive to track down the shooter and de-escalate tensions, relying on personal experience more than their rings' powers, hoping for a breakthrough.
Ma-Ti and his friend Red Elk, a Native American on his vision quest, find Hoggish Greedly and Rigger wrangling wild horses on protected land to sell them for slaughter and need the help of the other Planeteers to put an end to the scheme.
The Planeteers must stop a mother-and-son poaching duo who tears baby orangutans away from their mothers to sell them on the black market.
The Planeteers visit a lifelike simulation of Earth's environments to observe the long-term effects of pollution, but Dr. Blight traps them inside and the simulation's increasingly hostile conditions weaken their rings and Captain Planet himself.
The team must stop Looten Plunder from destroying an environmentally sustainable ranching operation.
The tables turn on the Planeteers when Hoggish Greedly secures a legal permit from the Army Corps of Engineers to build over precious wetlands and the authorities arrest Captain Planet; the team must stop Greedly while being hunted as fugitives.
When the Planeteers investigate a string of bat attacks in New Mexico, they discover Looten Plunder's nephew, Robin, staged the attacks to build publicity for his upcoming movie, and must put an end to Robin's fearmongering.
Aliens pit the Planeteers and the eco-villains against each other in a high-stakes game show to determine the fate of Captain Planet.
Verminous Skumm unleashes a swarm of hungry weevils upon a small town.
In the far future, a mysterious woman gives a young boy a virtual reality headset that allows him to interact with the 20th-century Planeteers as they fight to save gorillas from Looten Plunder's scheme to bulldoze an African rainforest.
After explosions at a plant catch the Planeteers' attention, Wheeler begins to suspect the plant owner's son has something to do with them.
Captain Planet battles Duke Nukem and Dr. Blight as the eco-villains ravage Canada.
Wheeler takes a sabbatical from the team to visit his ailing father in Brooklyn, but discovers that his old friends now belong to an anarchist gang and take orders from Verminous Skumm.
A whirlpool sweeps the Planeteers into the past, where they encounter the Mayan civilization.
Future descendants of Looten Plunder, Dr. Blight and Verminous Skumm travel to the present day to help the eco-villains eliminate a person whose influence on environmental matters will prevent their pollution-filled future from ever happening.
While on vacation, Gi visits a dolphin research facility and stumbles upon Hoggish Greedly's scheme to use the dolphins to haul toxic chemicals from a sunken warship and sell them on the black market.
Gaia asks the Planeteers to return orphaned animals to their natural habitats, but the team discovers that pollution threatens all of the animals' homes.
Dr. Blight creates an invention that transfers her mind into Gaia and uses her new powers to ravage the planet; trapped in Blight's body, Gaia must convince the Planeteers of the truth before the ecological damage becomes irreversible.
Linka receives a letter about a mysterious sickness spreading through her hometown and the Planeteers head there to investigate; overcome with concern for her town and her ailing grandmother, Linka gives up her ring and leaves the team.
The Planeteers investigate Hoggish Greedly's scheme affecting the threatened Louisiana black bear.
The Planeteers share stories from their past as they work to escape the salt mine; Captain Planet struggles to fight a revived Captain Pollution, who continues growing stronger as he wreaks havoc across Earth.
The Planeteers argue over what ecological issue to focus on, but Gaia assigns the team to stop Sly Sludge from dumping toxic waste into a salt mine; when Sludge traps them inside the mine, Ma-Ti shares an inspiring story to bring the team together.