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.
The Planeteers head South to meet their pal Milton who plans to show them all he's doing to preserve the endangered Mississippi River. But Ma-ti doesn't want a guided tour. He has delusions of experiencing the Mississippi like Huck Finn and Tom Sawyer did in the old days.
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.
The Planeteers join the circus while trying to rescue some stolen pandas.
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?!?
Eco-villains beware: Captain Planet is here to save the day! With the guidance of Gaia, five Planeteers - representing Earth, Fire, Water, Wind and Heart - come together to defend our planet from environmental destruction. With their powers combined, the team becomes the solution to pollution!