Hurra, die Schule brennt

Pepe Nietnagel and his fellow students of the Mommsen school come up with all kinds of ideas to get out of doing any actual school work. This includes simulating suicides, setting off the air-raid sirens and abusing the school director's new broadcasting system. They succeed in sending their teacher to a sanatorium and get a replacement that turns out to not be so bad after all.

Pepe Notnagel (who inexplicably had his name changed from the first movie's Nietnagel) and his classmates scheme to get around doing any actual school work by cheating or sending their teachers to the sanatorium. A Swiss documentary film maker disguises himself as his brother in law, who got a position as an exchange teacher, to aid his project of making a movie about the current youth.

Mommsen Gymnasium director Taft secretly places his nephew as a spy with the difficult class of Pepe Nietnagel. During the celebration for the 100th anniversary, a simulated fire forces the school to shut down for a week. The director's attempt to get a tough teacher assigned by the department of education results in the exact opposite because of Nietnagel's intervention.

Principal Gottlieb Taft's twin brother Gotthold Taft partakes in the most recent prank by faking his death and promising a large inheritance to the Mommsen-Gymnasium and the principal. Of course, the inheritance is tied to many embarrassing conditions.

Pepe Nietnagel's father has a valuable stamp collection stolen in Amsterdam. Street musician Pit recovers it. To show his gratitude, Pit is invited to Baden Baden and enters the Mommsen Gymnasium. There, he joins Pepe in his pranks.

Due to a plot by the teaching staff, headmaster Taft is forced into early retirement and Knörz is appointed headmaster. However, they didn't count on class 13a, and especially not on their spokesperson Pepe Nietnagel. They are anything but happy about losing Taft, their favorite enemy. Without further ado, Pepe and his friends join forces with Taft and hatch a series of daring pranks to get back at Knörz.

King Frederick II and his leading advisors hesitate too long in the eyes of some officers, so Major von Schill decides to strike out on his own. He hoped that his brave move would be the catalyst for the great war of liberation. But von Schill's troops were soon defeated by a superior force of Dutch-Danish troops. The king takes a public stand against von Schill's actions and eleven of his officers are shot by summary execution on Napoleon's orders. However, one of them, Lieutenant Heinrich von Wedell, escapes death and is sentenced to forced labor for life. When Wedell's brother Karl, who opposed von Schill's unauthorized actions, learns of Heinrich's fate, he decides to help him in a risky way...

Martin Hinterkirchner, dissatisfied with his position, sends the hits he has secretly composed to a manager. One of them would be ideal for the famous singer Linda Borg, but her manager refuses. Unfortunately, Martin now blames Linda and has nothing good to say about her - in contrast to his grandfather Leopold, who met Linda at a dog show. When Martin stands in for his untalented friend Peter as a singer at a hit song competition and mistakenly believes he has failed, he returns to his Tyrolean home village of Himmelberg. Peter, on the other hand, accepts a contract even though he cannot sing the required duet with Linda Borg and looks for excuses. Linda travels to Tyrol in a bad mood because she has received love letters from there. She has no idea that Martin's grandfather Leopold is the secret sender who wants to get her to sing Martin's hits.

Pretty hat-saleswoman Lola wants nothing more than to become an operetta singer. Unfortunately, it isn't so easy to make it in the music business. Operetta diva Isabella, on the other hand, is sick and tired of performing and leaves the stage, despite the fact that her partner begs her to stay, because without her he can't premiere his latest work on the stage.

A poor orphan boy runs away from the children's home and sets up his lonely fatherly friend with his youth welfare officer. As a result, nothing stands in the way of our hero's adoption.

Willi Winzig is a small tax officer with a big heart. He sometimes lets the tax files of his insolvent fellow citizens disappear into the air shaft. But shortly before his retirement, the shaft is so full that Willi has to dispose of the file of a penniless taxpayer in the wastepaper basket. The scam is promptly discovered and Willi is threatened with a hefty fine - even dishonorable dismissal from the civil service. Fortunately, friend and colleague Felix Klein knows what to do.

The 13-year-old Ludwig is to have for every joke. At boarding school he cuts his stern teacher, Captain a. D. Semmelmaier, during the nap from the beard. The angry pedagogue then sends the spoiled flail back to his beloved Bavarian village. The long-suffering mother persuades the rector to resume her reforming boy at the Latin school. Everything seems to be working out for the better, but the upcoming marriage of his sister Ännchen with the Berlin beer brewer Karl Schultheiss presents Ludwig with new challenges.

Leopold, head waiter at the "Weißen Rössl" (White Horse Inn), is secretly in love with the owner of the restaurant, Josepha. But she's only interested in the lawyer Dr. Siedler. Jealous, Leopold comes up with a plan to gain Josepha's attention.

Retired tax official Willi Winzig spends his retirement happily and contentedly in his home. However, this changes when his sister Heidelinde, her daughter and his father want to move in with him, and as Willi is a good-natured man, he takes them in, but because they have no money and his pension is not enough for all four of them, he has to take on a new job. He gets a job as a salesman for household appliances, but his good nature gets in the way again.

In Monte Carlo, a captain tries to raise the money to pay his crew at the gaming table, and meets and falls in love with a Queen.

Pepe Nietnagel and his fellow students of the Mommsen school come up with all kinds of ideas to get out of doing any actual school work. This includes simulating suicides, setting off the air-raid sirens and abusing the school director's new broadcasting system. They succeed in sending their teacher to a sanatorium and get a replacement that turns out to not be so bad after all.

Dr. Oskar Sommer, a good-natured high school teacher, takes on a momentous task for the school janitor, also named Oskar Sommer: he is to play the role of the janitor's daughter's father for a few days. Since the real father has not been seen for 15 years and has pretended to be a teacher in his letters, the two Sommers promptly pick up the wrong person at the train station.

A circus becomes the location for stolen loot and murder.