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And The Jetsons were patterned after the Blondie comic strip and movies. They even got Penny Singleton, who played Blondie in the films, to voice Jane Jetson. And Jonny Quest was originally going to be Jack Armstrong The All-American Boy.
But then, West Side Story was cribbed from Romeo and Juliet, so it's not what you copy, it's what you make once you copy.