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In page Hanna-Barbera:

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With the majority of American television animation during the second half of the 20th century made by Hanna-Barbera and more cartoons like CB Bears, Buford and the Galloping Ghost, The All New Popeye Hour, Godzilla and Casper and the Angels, major competition was coming from Filmation and DePatie–Freleng. Then-ABC president Fred Silverman gave its Saturday-morning time to them after dropping Filmation for its failure of Uncle Croc's Block.[citation needed]