Sylvester has been "blackballed" out of membership to the Loyal Order of Alley Cats Mouse and Chowder Club again. To gain the long-coveted membership, the Grand Master offers to let the lisping puddy tat place a big bell around the neck of the largest mouse he can find, so the cats can pounce on the mouse when they hear the bell. Just as that's going on, Hippety Hopper escapes from a city zoo truck. It's not long before he encounters the hapless Sylvester. Each attempt to place the bell around Hippety's neck ends with Sylvester wearing the bell (and the cats pounding the puddy into submission). In the end, Sylvester finally does get the bell around Hippety's neck, but by the time the cats are ready to pounce on the baby kangaroo-mistaken-for-a-giant-mouse, Hippety has been recaptured. The oblivious cats end up jumping in front of the city zoo truck! Sylvester now gets to serve as Loyal Order's Grand Master.
A baby kangaroo, Hippety Hopper, breaks free from a crate at the Zoo Office and hops into the house of Sylvester Cat and his son, Junior. They mistake Hippety for a giant mouse, and Sylvester is pummelled again and again by the playful kangaroo, causing Junior to put a paper bag over his head in shame for his father.
Sylvester Cat is a lighthouse keeper's mouse-catcher assigned to keep a mouse from unplugging the light. The mouse only wants a good night's sleep and asks Hippety Hopper, the baby kangaroo who has just crashed off of a ship on the nearby rocks, to help him fight Sylvester and keep the lighthouse light turned off.
Sylvester Cat and his dopey, brawny feline friend, Benny, hunt mice in a warehouse because Benny wants one as a pet. Hippety Hopper, the baby kangaroo, is in the warehouse, and the two cats, of course, think he's a giant mouse. Benny wants him and obliges Sylvester to try and catch the fleet-of-foot Hippety.
Sylvester Cat scoffs at his son's idea that a pipe like that of The Pied Piper of Hamelin could lure mice into their home to catch. But when Junior tries it and Hippety Hopper, the baby kangaroo, comes along, Sylvester believes in the power of the pipe and that Hippety is a giant mouse.
Sylvester Cat checks in to work at a museum with his son, Junior. He is bragging about his mouse-catching prowess when the baby kangaroo, Hippety Hopper, having escaped from the zoo, turns up in the museum. Sylvester and Junior, as usual, mistake Hippety for a giant mouse and chase him around the exhibits.
Sylvester Cat accepts a position as mouse-catcher on a ship, and his son, Junior, accompanies him. They encounter baby kangaroo Hippety Hopper being shipped from Australia and, as usual, mistake Hippety for a giant mouse.
A circus comes to town featuring Gracie the Fighting Kangaroo and her youngster, Hippety Hopper.
Sylvester Cat is a basket case, convinced that baby kangaroo Hippety Hopper is everywhere, around every corner, waiting to damage his pride yet again in front of his son. Junior takes his fearful father to a cat psychiatrist to whom Sylvester confides his constant frustration at being unable to defeat the "giant mouse".
A pudgy but tough-guy cat recruits Sylvester as his stooge to catch a mouse for his dinner, under the pretense of training Sylvester to be a champion mouser. Sylvester enters a warehouse and runs into the baby kangaroo, Hippety Hopper, and thinks, as usual, that Hippety is a giant mouse that must be fought.
A baby kangaroo hops out of his zoo cage and roams into the surrounding city. The kangaroo stops at Sylvester Cat's home while Sylvester is hunting for mice with a fishing rod. When Sylvester "reels in" the kangaroo, he thinks he has caught a giant mouse and makes a humiliatingly unsuccessful attempt to catch him.
Sylvester Cat takes his son, Junior, on a mouse-hunting expedition in an old, broken-down, mouse-infested house near some railroad tracks.
A mouse is saved from committing suicide by a baby kangaroo, Hippety Hopper, who he frees from a crate on the docks. His new friend, who looks like a "king-sized mouse," then helps him get revenge on Sylvester the cat.
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