Super Friends Season 1 Episode 6 The Shamon 'U'

Dr. Shamon uses a gigantic magnetic "U" to draw a solid gold meteorite to the Earth. However, he is unaware of the fact that his "sky-mining" technique has released some exotic gases from the space cloud, which, when united with the oxygen in Earth's atmosphere, form a green mist and a red mist. The green mist cause animals and plants to grow many times their normal size, while the red mist cause animals and plants to shrink.