An aggressive and sneaky Earth spirit named Zarm tricks the teens into disobeying Gaia, sparking a dangerous game that threatens to lead to nuclear war.

Nukem decimates the ozone layer so he can feast on ultra-violet rays.

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.

On vacation, Linka goes to Washington D.C. to visit her cousin and uncle. Unfortunately, trouble isn't too far behind, because Verminous Skumm has brainwashed her cousin into taking a new drug called Bliss, and now Skumm wants to have Linka under his power as well.

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....

People are collapsing in San Francisco with symptoms that suggest a whole range of pollution poisoning. As the Planeteers follow clues to solve this mystery, Ma-Ti (who is reading 1940s detective novels) keeps imagining himself as a private eye in black-and-white sequences. Ma-Ti proves a poor sleuth at first, but eventually he tracks down Verminous Skumm who is serving seafood tainted by storm drain runoff in his restaurant, The Sinking Ship.

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.

A roofless dictator decimates the land to fight the opposition, with total disregard to the environment and human life. But there is more to the story than meets the eye. The dictator is really an old foe of the Planeteers in disguise.

Blight convinces the president that global warming doesn't exist. Will a trip to Venus sway the leader?

The Planeteers have little time to track down a radioactive isotope that was released by two capsules from an old chemotherapy machine. But where there's radioactivity, there's Duke Nukem, and he's already got his hands on one of the capsules. Now the Planeteers must find the two little children that took the other capsule before Nukem does.

To prove to Duke Nukem that the human race will self-destruct; Verminous Skumm steals and plants nuclear devices in war-torn areas across the globe. He then plays a little war gaming and gives triggers to the warring factions in those areas. With a potential Armageddon on their hands the Planeteers race to make the opposing sides in each location see peace before they act on war.

An African boy from the future uses a virtual reality game and opens a door to the past where Looten Plunder is behind gorillas being poachered. He helps the Planeteers. The Planeteers call Captain Planet when things get out of hand.