Chased by Tom around the barnyard, Jerry takes refuge under a hen, who, in her nest, is sitting on eggs. Tom has to figure out ways to get Jerry out from under the protective hen.
Mammy Two-Shoes replaces Tom with a younger cat who is a lightning-quick mouser. Tom and Jerry form an alliance in order to get rid of this dangerous newcomer.
Tom is given the task of guarding the fridge during the night by Mammy-Two-Shoes, but as soon as he has started he is tricked by Jerry into falling into the basement, where he lands in a barrel of cider. Now drunk, Tom staggers around in the house getting up to no good with Jerry.
Jasper is given an ultimatum by his master: break one more thing and you're out. Rodent Jerry does his best to make sure that his tormentor "gets the boot".
Jerry is awakened from a nightmare by a knock on the door: someone has left a foundling in a walnut shell with a note, giving his name as Nibbles and saying he needs lots of milk. Fortunately, there's a dish handy, but it's next to Tom. Nibbles scurries out and dives off Tom's nose, then grabs a whisker for balance, waking Tom up. Jerry grabs him just in time and they hide under the milk. Tom laps up some milk and gets Nibbles; Jerry rescues him, and they run for the hole. Next, they try a very long straw; Tom catches them and sucks Nibbles through the straw. Much chasing follows, with a pause now and then for some milk. Tom traps Jerry in a milk bottle and chases Nibbles a while; he finally corners Nibbles and spanks him with a flyswatter. Jerry is so enraged he burst out of the milk bottle and lets out a ferocious roar; he grabs Tom by the tail and thoroughly pummels him, then stands over him as Tom feeds Nibbles milk.
Tom's advances on a young jive-talking girl cat get nowhere; nowhere, that is, until Tom gets a zoot suit. Armed with his miles of fabric and a new cool lingo, Tom still has to deal with the tricks of his nemesis, Jerry.
Tom hears a ghost story on the radio and is spooked by it; Jerry notices this and takes advantage of it, using a variety of tricks to scare Tom.
Jerry narrates in voiceover: Tom has fallen hard for the cat next door, and competes with rich cat Butch for her affections. But Butch outspends Tom to a ludicrous level at every turn. Tom goes downhill after that, until we see him contemplating suicide.
The Easter bunny brings an egg for Tom and Jerry that hatches into the little duckling. He keeps getting into water he shouldn't: the aquarium, water cooler, bathtub, sink, as the boys keep rescuing it. They try to give the duck back to the Easter bunny - no go. They leave it in the pond at the park and think they're home free, until the duckling brings his friends home.
Jerry is far from Tom's servant here. Tom, shipwrecked, washes up on a tropical island. His first attempts at food - a coconut and a turtle - are much too hard. But he spots Jerry just before Jerry sees him, and soon has him in the frying pan. Jerry escapes to a cannibal village; when he sees Tom's frightened reaction, he has his plan. Using soot from a pot, he blackens himself, then threatens Tom and starts cooking him. But Jerry's plan - and tail, and un-blackened bottom - is exposed when his grass skirt comes off during his war dance. Jerry helicopters away using the bone in his hair, and leading Tom right into the real cannibals. But Jerry's triumph is short-lived, as a pygmy cannibal comes after him.
Jerry runs into a dog pound (and right on top of a napping Spike) to escape a rather mangy-looking Tom. To avoid being ripped to shreds, Tom borrows the head of a nearby dog statue. This easily fools the dogs, but not Jerry, and Tom keeps losing his newfound head...
Tom enters from stage left in white tie and tails, sits at the piano, gets his focus as the orchestra in the pit beneath him warms up, and begins to play Liszt's "Hungarian Rhapsody". Unbeknownst to Tom and the audience, Jerry is asleep across several of the high-note keys inside the instrument, so Tom's playing eventually wakes him. Jerry is pummeled by hammers, bounced by wires, and squeezed by Tom as the cat tries to play the concerto while dispensing with Jerry. Jerry's defensive antics add to the brio of the program and answer Tom with Jerry's own skillful musical attack. By the concerto's end, the duet leaves only one animal standing for the audience's applause.
Spike is guarding a private fishing hole - in his sleep. Tom sneaks in to do some fishing - with Jerry as bait. But one particularly vicious fish turns out to be more than Tom or Jerry bargained for, particularly when he wakes up Spike.
Tom ties up Spike and sneaks into the courtyard of the glamorous Toodles Galore with his bass, hoping to woo her with his song, much to the annoyance of a sleeping Jerry.
Spike the bulldog, grateful to Jerry for getting him out of the dogcatcher's van, offers to help the little mouse any time he whistles. Tom, Jerry's feline tormentor, seeks to overcome this new disadvantage.
Jerry crashes a vase onto Tom's head, which gets Mammy to throw Tom out. Jerry at first revels in his freedom, but soon tires of this, and, under a flag of truce, hatches a plan with Tom.
It's snowy and cold outside, and warm inside where Jerry squeezes past a mousetrap to cavort under a present-laden Christmas tree. Mistaking the sleeping Tom for a plush toy, Jerry wakes him and a mad chase ensues.
As Tom and Jerry stage their typical fight sequences, the patriotic soldier theme of the title is evidenced by such things as a carton of eggs labeled "Hen Grenades"; Jerry dropping light bulbs from an airplane like bombs; and Jerry sending a telegram with the message "Sighted Cat - Sank Same." Musical phrasings from various patriotic war songs are heard throughout.
Tom's chasing Jerry when he runs right into a sleeping dog and the two of them must work together to fend him off.
Tom, sick of Jerry stealing the milk out of his bowl, poisons it. Instead of killing the mouse, the potion transforms him into a muscular beast.