Sally and Nick are making paper airplanes, but have run out of paper! Luckily Cat's friend Dr. Twiggles can help them! Off to the Woody Wood Woods to see him. There, Dr. Twiggles shows them how to make new paper out of old paper — recycling! They watch how the old paper is shredded, then water and cleaner are added to make it into a thick, soupy mess! Then they put it through rollers that flatten it into large sheets of paper! Now Nick and Sally can make their airplanes, and the best part, they used recycled paper!