Which character was not voiced by Mel Blanc?

The correct choice is that Fred Flintstone was not voiced by Mel Blanc. In the original "The Flintstones" series, Fred Flintstone was voiced by actor William Hanna, who co-created the series alongside Joseph Barbera. Mel Blanc, renowned for voicing numerous iconic characters, including Bugs Bunny and Daffy Duck, did not provide the voice for Fred.

While Mel Blanc voiced many memorable characters in animation history, the role of Fred Flintstone was significant as it marked a distinct collaboration between Hanna-Barbera's founders. Characters like Barney Rubble, Mr. Spacely from "The Jetsons," and Captain Caveman were indeed voiced by Blanc, showcasing his incredible range and talent in bringing animated characters to life. This particular distinction highlights the varied contributions within the animation industry and emphasizes Mel Blanc's legacy in voicing various characters, while also recognizing the unique contributions of other voice actors.