The Mráz family is preparing for holidays. Parents are traveling to the spa and little Petr is going to the country to his grandparents. In addition, to the chaotic preparations, mother's friend is bringing a dog Blek. She wants Petr to look after it. Grandfather welcomes Petr and the dog with pleasure because he needs the ally against strict grandmother. Grandfather is not very skillful and thus grandmother often experiences troubles with his ideas.

Pavel Hora offers his friend Jiří Pulpán a place to live. When they get home, they find out that the landlord has evicted Pavel to the yard because he found a love letter from his daughter Zuzanka. So the two men arrange an apartment in the yard. When the landlord catches Jiří with his other daughter Pepička, he sends both daughters to his brother Sylvester on the farm.

Surly solitary truck driver is given an assistant for his daily rounds: a young woman with a fondness for mini-skirts and boys, fresh out of prison.

Vlasta Burian, as a stowaway, disrupts the disciplined operation of a railway station. Mr. Ťopka gives the impression of a gentleman, somewhat Chaplin-like. He makes a living by doing odd jobs, for which he exclusively rides the train as a stowaway. During one of his trips, he meets the feared railway inspector general Kokrhel. At a small station, he manages to get out and change into the stationmaster's uniform. However, he cannot avoid meeting Inspector Kokrhel...

Grammar school teacher Bláha hurts himself in pursuit of a red lizard, and is lying unconscious in the lonely house of Santrucek family. The postman, who found Bláha's coat and hat in the water, announces to everyone in town that the professor has drowned. But, the venerable citizens are at that moment more interested in the theatre group with the beautiful guest actress Eva Gazdová. They demand a change of repertoire and manage to persuade the theatre manager to have the group play the musical comedy The Red Lizard instead of an established play.