Captain Planet and the Planeteers - Season 2 Episode 3 -

Ma-ti is fooled when Looten Plunder disguises himself as a scientist, promising to clear the air all over the world, including his tribe's village in the rainforest. After Wheeler and the tribe are trapped inside one of Plunder's domes, and Ma-ti is captured after discovering Plunder's scheme, the remaining Planeteers have to find them both and bring Plunder down.