Mickey Mouse and several other characters are on a prison chain gang, guarded by Pegleg Pete. They break rocks for a while, then Mickey breaks out a harmonica and everyone starts making music and/or dancing. Soon there's a jail-break, and Mickey's on the run, tracked by bloodhounds (including his future pet, Pluto, in his first appearance). He falls off a cliff and right into a jail cell.
A baby elephant rolls off the circus train and right into Tom's bed. He quickly allies himself with Jerry, and with a rolled-up trunk and some paint, passes himself off as a giant mouse. The two then keep trading places to the bafflement of Tom.
Tom, whose appetite was whetted by a radio cooking program, wants to make a meal out of the pet goldfish. Jerry, who is friends with the fish, does what he can to thwart their feline foe.
Jerry agrees to help an escaped circus lion, whose first need is food. But first they'll have to evade Tom, who heard the news bulletin and is armed with a shotgun.
When Tom's harassment gets out of hand, Jerry writes to his Cousin Muscles, a tough inner city mouse, and asks for his help.
The kiddie radio host, Uncle Dudley, reminds his listeners that it is "Be Kind to Animals" week. Tom resolves to be kind to his mouse-nemesis, Jerry, but the cat changes his mind after sneaking a look at Jerry's diary.
A village of dwarfs dance and play through their day. A blacksmith shoes a centipede, a street-cleaner sweeps, a marching-band strikes up and the townsmen roll out beer barrels.
Mickey Mouse lies in bed like a lord, getting served breakfast by man's (and mouse's?) best friend Pluto as gentleman's gentleman. Next duty is to fetch the paper, but also pay for it with a coin for the vending machine, and those round things have a nasty habit of escaping a dog's teeth and bouncing over the pavement till they end up in the gutter. After enough attempts to fish and spend the penny, Pluto has a newspaper to carry the same way. The wind has a nasty way to get a better grip on page after page then the dog, so by the time he delivers the daily dose of printed news it's an embarrassingly muddy mess.
Mickey's going golfing, and Pluto is his caddy. Besides the usual caddy duties, Pluto runs to the ball and points to it. But when the ball lands in a gopher hole, Pluto's got another task: chase the gopher. They eventually chase each other through a number of holes in a knoll where Mickey is trying to putt out, causing the knoll to collapse.
Pluto is tied up in the backyard and has been ordered by the maid to stay outside while she prepares a roast. Of course, once Pluto smells the scent of the roast, he makes a beeline for the kitchen. Unfortuantely, staying undiscovered proves difficult for Pluto once he gets inside particularly after he inhales a bucket of soapy water and starts sneezing. Bubbles fill the kitchen and cups are broken at which point the maid comes downstairs. Luckily, Pluto returns to his doghouse leaving the impression that he never left. The maid just shrugs and says, "I could swear it was that dog."
Pluto and Pluto Junior are enjoying a lazy afternoon snooze when the playful pup tangles with a ball, a balloon, a worm, a bird, and a clothesline. Pluto rescues his son from a precarious situation, gets hung up in the process, but manages to land with a splash.
Donald runs a shooting gallery. His nephews come by and he offers them a free shot, but when the first one hits all the targets, the notoriously cheap Donald switches a cheap prize for the correct one. He then gives the other two boys gimmicked guns; the last one is empty, but the targets break anyway because one boy is hitting them from behind. Donald chases them off; they use the mystic's booth next door to get revenge.
In the logical sequel to Springtime, a new set of insects (mostly) dances to a new set of tunes, while doing summer activities. The insects include dung beetles, dragonflies, butterflies, a walking stick, bees, and various other beetles and flies.
Mickey guest-directs a radio orchestra. The sponsor loves the rehearsal, but come the actual performance, Goofy drops all the instruments under an elevator, so they sound like toys. The sponsor hates it, but the audience loves it anyway.
Mickey accidentally takes a seal home, after it sneaks into his picnic basket. When Mickey takes a bath, the seal is discovered and Mickey returns him to the park. Later, however, Mickey and Pluto discover that the bathroom is filled with seals!
Mickey, in the Australian bush, throws a boomerang that gets caught in Pluto’s mouth. Mickey then discovers an egg of an emu. Unfortunately, the parent chases him, but Pluto and the boomerang zoom into his path, leaving the emu all tangled.
Mickey hosts an amateur hour radio show.
The gang throws Mickey a surprise birthday party; his present is an electric organ, which Minnie plays while Mickey does a jazzy dance. Goofy bakes the cake, but keeps having trouble with it falling. The gang does a conga line to a Latin tune.
Mickey is ringmaster of a circus for orphans. Donald has a trained sea lion act, and does a bit of juggling himself. Mostly, though, he fights with a baby sea lion who keeps stealing both the fish and the show. Donald then finds himself and Mickey in an unrehearsed high wire act, which kicks into high gear when one of the orphans electrifies the wire. They end by doing a high dive into the seals' tank.
Even though Mickey's evening started slow and lazy, things get moving in a hurry when Minnie calls from outside the big dance, wondering why he's late. Luckily his best pal Pluto is happy to help wrangle the uncooperative evening wear and help get him out the door...without the tickets