Scooby-Doo and the Alien Invaders Original Production Cel with Matching Drawings Signed by Bob Singer: Scooby, ShaggyScooby, Shaggy MEDIUM: Original Production Cel on Printed Background with Matching Drawing IMAGE SIZE: 10. 5" x 9" Cel & 10. 5"x 9. 5" Drawing PRODUCTION: Scooby Doo and the Alien Invaders, 2000 SKU: IFA4637 ABOUT THE IMAGE: The Hanna Barbera cartoon, Scooby Doo, Where Are You? was launched in 1969 and has had the longest run of a cartoon series. Over the years its been in 19 TV series (on CBS, ABC, the WB, Cartoon Network and Boomerang) and more than