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 Junior. 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 when he erroneously thought that Hippety swallowed his son alive when catching him with fly paper, it was Sylvester who put a paper bag over his face in shame similar to what his son did earlier, while Junior who emerges out of the fly paper stuck on Hippety's body alive and unharmed, shared his lollipop with Hippety.
This is the first cartoon which Sylvester Junior would cover his face with a paper bag in shame when he witness his father's humiliating defeats in catching mice, birds or fish, which becomes a running gag in the Sylvester/Sylvester Jr cartoons, especially the ones co-starring Hippety Hopper.
In the middle of the cartoon from after when Sylvester emerges from the kitchen door with his face battered and beaten up for the second time up until the scene where Sylvester gets kicked out of the kitchen by Hippety, Sylvester's face was erroneously miscolored white instead of black.
On all European PAL TV broadcasts of the cartoon, such as Boomerang France, for some odd reason on the English Audio Track the 1946-1955 Looney Tunes ending music cue is replaced by the 1955-1964 Looney Tunes ending music cue, though on the foreign language dub tracks the original ending music cue is retained. A similar audio error also occurs in European PAL TV broadcasts of "Daffy Duck and the Dinosaur" (1939) and "All a Bir-r-r-d" (1950).