The Slap-Hoppy Mouse
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Sylvester takes his son, Junior, on a mouse-hunting expedition in an old, broken-down, mouse-infested house near some railroad tracks. Baby kangaroo Hippety Hopper falls out of a passing train and turns up in the house. Sylvester and Junior, as usual, mistake him for a giant mouse, and Sylvester is obliged to fight the playful Hippety.