Super Friends - Season 1 Episode 6 The Shamon 'U'

Dr. Shamon is using a giant magnetic "U," a laser gun, to draw a solid gold meteorite to the Earth. However, he's unaware of the fact that his "sky-mining" technique has reelased 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 causes animals and plants to grow many times their normal size, while the red mists causes animals and plants to shrink.