Captain Planet and the Planeteers

Volcano's Wrath (1x10)

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Sly Sludge thinks he has the answer to the world's trash problem: dump all the garbage into a Volcano on Laipuno Island, using it as an incinerator. Knowing the natives object to this, he pulls a phony trash shrinking scam as a cover. The volcano soon erupts, and the Planeteers and Captain Planet have to rescue the Island natives.