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Characters created for Hanna-Barbera by writer Michael Maltese, and based on the cartooning of Charles Addams. Mr. and Mrs. J. Evil Scientist never had a cartoon series of their own but appeared in several Snooper and Blabber cartoons, and one Snagglepuss cartoon (all written by Maltese) between 1959 and 1961. On-sale date from 1965 Books and Pamphlets, Copyright Office, Library of Congress.