Sylvester J. Pussycat, Jr., often shortened to "Sylvester Junior" or simply "Junior," is an anthropomorphic kitten appearing in Warner Bros. Animation's Looney Tunes and Merrie Melodies cartoon series, created by director Robert McKimson. He and his dad, Sylvester The Cat, are often seen antagonizing Hippety Hopper, a joey whom they believe is a "giant mouse." This generally leads to Sylvester's getting beat up, much to Junior's humiliation and shame.

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