Which famous literary brand mascot was created in 1935 by children's book publisher Theodor Seuss Geisel before he became famous as Dr. Seuss?

Throughout publishing history, certain literary brands have created memorable mascots that became cultural icons in their own right. These mascots have helped build brand recognition and loyalty among readers of all ages. Test your knowledge of these literary brand ambassadors who have graced book covers, advertisements, and merchandise for decades.

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The Penguin (Penguin Books)
The Cat in the Hat (Random House)
The Running Man (Alfred A. Knopf)
The Cat in the Hat with a Fish (Standard Oil's 'Essolubes')