The boys of Class 3C buy a luxurious and enormous apartment for a paltry sum. Naturally, none of them questions why such a large house costs so little. Soon, the boys discover the reason: the house, which once belonged to a magician, is haunted. The boys, in turn, are mysteriously kidnapped by Igor, the deceased magician's assistant, who aims to own the apartment. Unmasked, however, Igor ends up working as a butler.

During their vacation, the "3rd C" kids are hired as new faces by a ramshackle film crew filming a ridiculous remake of "Indiana Jones" in Tropea. For our eight inexperienced extras, the glories of the movie world will be a huge disappointment.

Chicco, Massimo, and Bruno Sacchi are on vacation in Tropea with Sharon Zampetti. Due to an agency error, the Zampetti family and the Sacchi family (Bruno's), find themselves renting the same house. Unable to change, they mutually decide to vacation together. Bruno also invites his other friends. Over the course of the summer, the kids become rivals to a young nobleman, Prince Leopoldo, with whom Sharon has fallen madly in love. But eventually, the kids discover that the Prince is penniless and only wanted to marry Sharon for money.

The big moment has arrived. Our nine students from Class 3C are just one step away from the fateful finish line: their final exams. They all share a common feeling: fear, and are gripped by a sudden and frantic attachment to their studies. Sharing the anxiety and strain of those moments is an unusual private student: Commendatore Zampetti, forced by work to sit his final exams alongside the students from Class 3C.

Bruno Sacchi absolutely needs a car. It will save him from being constantly late for school and spending endless hours on the train. Unfortunately, Chicco and Puccio are his driving instructors. When he finally gets into his first car, a battered old dud given to him by the same old Ciro, the impact of city traffic is truly traumatic for Bruno.

Sometimes it's worth debunking the old cliché that perpetuates antagonism between students and teachers. That's what the students in Class 3C think when their distraught Italian teacher confesses he's in serious trouble due to an eviction order. To help him financially solve his problems, the students mutually make the fateful decision: "Let's go to work." They improvise, taking on the most diverse odd jobs: clerk, delivery driver, fortune teller.

There's war between the 3rd C and the 3rd F! Luckily, it's just a "soft" war with toy guns and tracer bullets, which leave only a red stain on the victims' uniforms. Nevertheless, General Chicco's soldiers take their little war very seriously. Boys and girls, mindful of so many war movies, transform themselves for the space of a weekend into tough guys, sharp strategists, and heroic kamikazes...plus one shirker: Bruno Sacchi.

Our classmates become the protagonists of a thrilling news story. Two escapees, wanted throughout the city, find refuge in 3C and take the students hostage. Outside the high school, the police are mobilized, the parents are distraught, and Puccio's local TV station follows the drama live with bated breath. Only the students, overjoyed, enjoy the suspenseful day as a tempting diversion from school. The two convicts, in fact, prove completely harmless and are the only ones to experience truly terrifying hours, victims of the unbridled students of 3C.

Are Chicco, Massimo, Bruno, and Daniele real men? They're sure of it, and to counter the derision of their schoolmates, they decide to prove it by enrolling in a grueling survival course. The outcome is obviously disastrous. The boys quickly realize they're not cut out for a wild, adventurous life. Furthermore, rather than a survival school, the four discover they've enrolled in a real concentration camp, run by the fearsome German jailer Bruno Kaiser. They learn, therefore, only one way to survive: escape.

A mystery unfolds in class 3C. Many students' snacks mysteriously disappear from the classroom. Food thefts become increasingly frequent, and among the students, excitement gives way to nervousness and furious protests. Chicco decides to take matters into his own hands and, assisted by Bruno, launches into a thorough police investigation to track down the culprit. Naturally, Chicco and Bruno seem unlikely to be playing Sherlock Holmes and Dr. Watson.

Classes 3C and 3D have been feuding for years. To put an end to an untenable situation, the "historical leaders" of the two classes, repeaters since time immemorial, organize a boxing match. Class 3C is represented by Massimo (Renato Cestie'), a handsome and bold athlete; class 3D, however, pits him against a giant, a newcomer nicknamed Terminator. Thus, a typical "Rocky situation" unfolds, with Massimo undergoing intensive training to overcome a feat deemed impossible by all. Like a Stallone, against all odds, Massimo, despite being severely pounded by his massive opponent, manages to win.

Election battle among the students of Class 3C. In this third episode, the young protagonists are all leading their own lists, a "pluralism" born of delusions of grandeur and the usual rivalries. With just a few days to go until the election, none of the lists has yet managed to obtain enough signatures to run for office. They therefore fall back on an alliance that appoints as their representative the only one left out of the fray, the usual Bruno. After an unexpected success, Bruno is elected, but once on the school board, he fails to assert himself due to excessive shyness.

A beautiful sunny day just as a catastrophic class test is due: the temptation is too great, so Chicco and Bruno skip school and go to the beach, thinking about "those poor souls" locked in the classroom. At the beach, however, the two "deserters" discover that their classmates have all had the same idea. Benedetta is drawn to an "exceptional" cultural event, a poets' festival. Daniele and Rossella have planned a romantic picnic for two. Massimo has invited the beautiful Sharon on a motorcycle ride. Even a couple of parents, Sharon's father and Massimo's mother, are in the area, with extramarital plans: and now they're only worrying about hiding. Even the "obligatory" fun of the kids on extra vacation turns into hellish stress.

At the initiative of Dean Chicco, the 3Cs revive an ancient school tradition: the class newspaper. Once the duties are distributed—Chicco edits the sports page, Daniele and Rossella the favorites, and Benedetta (Nicoletta Elmi) the horoscope and movie reviews—the search for a sponsor begins. Sharon's father, seeing the newspaper as a way to advertise his cured meat company, steps in. To boost sales, Chicco has the dubious idea of putting a nude on the cover, using a photomontage of Sharon's face and the body of a black Playmate. Against all odds, not a single copy of the "3Cs Newspaper" sells. But Sharon's father, furious with the photo of his daughter on the cover, buys up the entire print run to save the rookie journalists from debt.

To postpone the deadline for some very tough exams, the students of Class 3C invent a visit from an Oxford professor—actually a former student, a chronic repeater like Chicco—persuading the principal to fund a performance of Shakespeare's most famous works. Chicco plays Iago, Massimo plays Cassio, Sharon is Ophelia, and Benedetta is, of course, the occasional director. In Class 3C's unique "interpretation," however, the English playwright's works become ignoble farces, with only Bruno escaping, forced to play Othello, who on the day of the "premiere" (and final) performance achieves an unexpected personal success. But once the curtain falls, the story of the fake English professor comes to light. Tragic "reruns" are prepared for everyone.

Big plans for the upcoming Christmas: naturally, the kids all agree on the idea of an "alternative" holiday, without parents in the way or other ritualistic conventions (tree, nativity scene, bingo, Christmas dinner, etc.). Chicco and Massimo would like to go on a ski holiday, Benedetta dreams of an exhausting movie marathon, Daniele and Rossella are thinking of romantic moments. They all end up meeting on Christmas Eve at the bar in front of the school with so many wonderful plans ruined. All that's left is to go to "poor Bruno," who's trapped in a Christmas dinner with his relatives. The Christmas rebels will thus be drawn into the more traditional celebrations of the holiday (including the bagpipers) and, what's worse, much to their delight.

Double the party, and double the setbacks, for the kids in Class 3C on Sharon's birthday. Invited by her partner to her parents' luxurious villa, they have to find a new home because their father is under the tax authorities' scrutiny when they arrive. The large group of guests, along with the buffet and the Zampettis' waiter, "move" en masse to Bruno's house, a more cramped space where dancing becomes a feat for contortionists. What's more, when it's time to dance, Bruno's parents and the tenants, who insist on holding a condominium meeting, enter the fray. Sharon thus experiences the most stressful birthday party of her life.

Carnival is in full swing. For the occasion, the principal has organized a party in the school gym, attended by teachers and parents. It's clear that the students in Class 3C have other plans for their Carnival. On the evening of Fat Thursday, each of them, unbeknownst to their classmates, goes in costume to a large Brazilian party, hosted by Aziz and Puccio at Villa Zampetti. When the host unexpectedly returns, the disappointed students, victims of numerous misunderstandings, will be forced to quickly transfer the festive atmosphere of the Rio Carnival to the Sacchi household.

Chicco, Massimo, Daniele, and Bruno are planning a major heist at Leopardi High School. They must be very careful not to be discovered because their prank, even if it's for a good cause, is punishable by law. Their goal is to falsify the final exam transcripts and promote poor Tisini, who has unfairly failed her class. The students find a valuable collaborator in Mauro, who helps them falsify the report cards.

Mauro has found a job as artistic director at a private TV station of dubious standing. He tries to involve his friends at 3C in his new and exciting venture, entrusting them with the task of managing the schedule (the day's programs) and promoting the most interesting television programs with the aim of increasing their audience.