Brewster is frightened when he hears thunder, and the friends ask, 'What makes the sound of thunder?' Up in the clouds, they meet Cloudy Nimbus who informs them that the clouds rub together and release their shock called lightening and that makes the loud sound. Discover answers to questions only young children ask! Through creative thinking, Brewster and Maggie take young viewers on a journey of discovery in a way that will not only entertain, but will get their creative thinking caps on!   Based on the book series `Brewster the Rooster' by Clifford Parrott.