From Press Kit: Katnip's serenading of a girl cat is interrupted by a tough cat that runs him off and takes over.The love-lorn Katnip is determined to best the muscle-bound cat and enlists the aid of Herman. Herman, with bad-intentions, puts Katnip through a muscle-building course which consists of weight-lifting, bar-chinning and equipment rigged with high explosives.
While cats and dogs are natural enemies, such is not the case in the house where Herman the mouse lives. They are very good friends indeed, are work together to make Herman's life a hard life. Herman tries to break up their friendship, and divert their attention from guarding the cheese in the refrigerator, and almost succeeds but they make up in time to prevent Herman getting the cheese. They give chase and Herman takes refuge in a jug of wine.
Herman battles Katnip in a costume epic satirizing the Robin Hood story. Katnip is the offical tax collector. Taxes have gone up 100%. The first place that Katnip hits is Povertyville. No money there... only Robin Hood Herman. Herman follows Katnip back to the castle and recovers the money for the mice after a battle. Katnip gets sliced clean down the middle with a fancy medieval executioner's axe!
Herman rescues Princess Genevieve, who has been captured by baron-robber Katnip. Good music score on this cartoon.
Herman and Katnip in an art school.
Unaware that Katnip is the night watchman, Herman takes his three nephews to Paramount Pictures Studios on a sightseeing trip. They sneak in and find fake alligators and a fake King Kong, but a real live Katnip. Herman promises to make Katnip a movie star if he will let them go.
Herman rescues Louise by using magic on Katnip.
Herman tries to get fed but has to watch out for two crazy roosters.
In the deserted ice-cream parlor, the thirsty mice are never able to drink their concoctions because Katnip the Kat keeps them running for their little mice-lives. But Herman, the brother mouse, arrives with his bag of tricks. Herman tricks Katnip into swallowing a bottle of sleeping pills and, while Katnip snores, the mice enjoy their sodas.
The mice are having a great time playing on a train in a department store's toy department until night watchman Katnip comes along.
Herman the mouse and his little mice pals are having a good time in River City's pool-hall, that doesn't have a billiards table anywhere in it...and that spells trouble when mice are playing pocket pool, and it soon arrives in the form of Katnip Kat looking to cause some disturbance. But, having just read a horror book, Katnip is a bit off his usual game and is a bit nervous. Herman, crafty as ever, plays on these fears and Katnip is scared off.
Katnip is out in the cold, cold snow; but he thinks maybe he won't go hungry this Christmas. He sees a warm house with a warm fire, and a lot of warm mice about to have a nice, hot turkey dinner. Katnip scams his way into the house by disguising himself as Santa Claus. And then he chases the mice into their hole by throwing Christmas ornaments at them. Cousin Herman arrives and is tantalized by the tempting aroma of the turkey. The sad mice show Herman why they're all shivering in their freezing hole. There's Katnip at the fireplace hanging up an enormous stocking next to a very long Christmas list. But wily Herman is not about to let a mangy cat dampen everyone's holiday spirits.
Katnip teaches his little nephew Kitnip how to catch a mouse. Kitnip goes into Herman's mousehole and gets stuck under a pipe. Herman rescues Kitnip. Instead of being a supposed enemy, Kitnip becomes Herman's friend instead!
"Hoiman" and his ratty mice cousins, to escape the winter cold in Brooklyn, hop a streamliner going to Florida. Katnip is also on board and chases the mice from the baggage compartment to the mail car. Herman utilizes very mechanical device available to derail Katnip, and finally uses some war-surplus equipment to shoot Katnip out in space. He lands at the North Pole and is freezing while the mice are living it up on a Miami beach.
Under Captain Herman, work for each mouse-sailor is more like play. But the fun ends when they bring aboard a castaway who turns out to be Katnip the Pirate.
In the frozen North, Captain Herman of the Northwest Mousies is trying to capture notorious outlaw Pierre Katnip, who has been robbing the little mice of all their food. It's a battle to the finish, but Northwest Mousies always get their man... or is that cat?
Herman gets back at Knucklehead from cat college Quinston for crashing the Harbard (the mice's college) Alumni Dinner.
The city-slicker mouse, Herman, takes his bumpkin country cousins for a night on the town at a penny arcade. Katnip the cat, Herman's long-time nemesis, is present and spoiling the party so Herman floats him away with some hydrogen-filled balloons. But the pesky Katnip returns and after some furious cat-and-mouse games, utilizing all the slot machines and games in the arcade, Katnip ends up as the loser, ending up as the target in the shooting gallery.
The mice are having their after-hours way with a feast from the Free-Lunch counter in a western saloon when the dreaded-and-feared Cat Carson, aka Katip, shows up and starts a reign of terror in the wild west. But Herman, the city-slicker cousin of the western-rodents shows up, rescues his kin from the clutches of Cat Carson, and then goes to work on the villain himself.
Herman, the city-slicker mouse (looking like a cross between James Cagney and Lee Tracy) visits his barn-mice cousins in the country.