SolarmovieOne

Watch The Slap-Hoppy Mouse (Short 1956) online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Sylvester Cat 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.