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Pepe
From Arthur Wiki
Pepe A flea friend of Pal and Kate who tells stories. He is first introduced in "Flea To Be You And Me", and later reappears in "Mei Lin Takes a Stand" and "Around the World In 11 Minutes".
Mike Finche appears in the episode Buster Spaces Out, when Buster, Arthur, Francine, Muffy, George and Carl are trying to launch a rocket.