A baby kangaroo, named Hippety Hopper escapes from the crate that he was put in at the Zoo office and runs into the house of Sylvester and his son, Sylvester Jr. They mistakenly think that Hopper is a giant mouse. Sylvester is constantly pummeled over and over again by the Kangaroo. In the end Junior puts a paper bag over his face, in shame. Later it was Sylvester who put a paper bag over his face, in shame, while Junior shared his lollipop with Hippety.
This was the last Sylvester cartoon to be animated by Emery Hawkins.
In the United Kingdom on Boomerang, although this cartoon is a Merrie Melodies short, it uses the Looney Tunes closing theme (1955-1964).