Berlin, shortly after World War II. Five parentless siblings, led by the oldest sister Inge Kuckert, search for a place to stay and a basis of existence in the destroyed city. A bombed villa in the Grunewald seems to be the right "cuckoo's nest", but an alleged authorised disposal tries to drive the siblings out of the building. Fortunately, the friendly neighbor can help.

On the afternoon of Christmas Eve, Sister Angelika bids her boss, Professor Reimers, farewell, for she has quit her post. Reimers doesn’t understand the reason for this and since she won’t say a word as to why she’s quit, he asks her to spend the evening with him and his son Konrad. Konrad, however, wanted to take advantage of the holiday to bring his divorced parents back together and sends Angelika packing as soon as she reaches the house. Disappointed and sad, she drives to the airport to meet Captain van Santen, who also invited her to spend the holiday.

Krestan Serbin, a 64-year-old Sorbian farm-worker, considers himself non-political. He owns a few acres, a few pigs and a cow, and intends to pass all this on to his daughter Lena. Lena, however, shows only little interest. Krestan’s situation becomes more difficult when he is meant to become integrated into the agricultural production cooperative. He even gets offered a position as Training Supervisor. Although Krestan does not oppose the new policy, he is unwilling to surrender his properties. When the political die-hards who intend to hinder the progressive movement try to win him over, Krestan realizes that it is time to show colours.

After Jochen saves police officer Erich's life, the two men become close friends and Erich helps Jochen get a job working for Berlin's local train system. But Jochen falls into the hands of the beautiful West Berlin agent Ellen, who convinces him to participate in acts of sabotage against the trains. All of a sudden, Jochen is making a lot more money and even Erich's former girlfriend Inge becomes interested in him. But everything begins to unravel when Erich observes his friend's illegal activity on one of his nightly rounds.

French milliner Yvette has a small fashion salon in Düsseldorf. The young gentlemen of society fall at her feet, but she is not accepted into their circles. That's why her former lover Maurice Daurignac manages to persuade her to pull off a big coup to get revenge on "high society". She pretends to be the heiress to ten million gold francs. A notary arrives from Paris accompanied by two supposed policemen and delivers the alleged money in a sealed parcel to the Bleichstetter bank in Düsseldorf, where it remains until the end of the inheritance process. The case drags on, and in the meantime the two are living large. When the bombshell bursts, Yvette has the young lawyer Dr. Hellmer to thank for the fact that she cannot be thrown to the angry citizens.

The two half-orphans Reni and Rolf are 13 and 10 years old and they live with their grandmother in Berlin. Their father has died during the war, their mother works at a Baltic Sea port. Here she meets a captain who wants to marry her. When their mother tells them about the planned wedding, Reni and Rolf are reluctant to meet the captain.

Ed Martin witnesses a murder at the hotel. Although the perpetrator is caught, he had previously taken papers from the victim's bag that prove a criminal connection between politicians and gangsters. The murderer's silence is bought with his release. But as the case has stirred up too much dust, a new perpetrator has to be found: Ed Martin, who witnessed everything. Beaten half to death, he confesses to the crime, but later recants. In the meantime, he has also found friends who want to defend him. Then he is found dead in his cell. The police who hanged him claim suicide.

The film "Die Unbesiegbaren" covers an episode in German history, in which the Bismarck government tried to mitigate the rise of the social-democrat movement.

Berlin 1952, seven years after WWII. Four women are looking for a good man and happiness in the divided city. Their destinies are loosely connected through one person: the West Berlin dandy and womanizer, Conny.