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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 and Godzilla, 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]