Based on the operetta of the same name by Carl Milöcker. The residents of an Austrian town decide to teach their eccentric mayor a lesson. A young fisherman dresses up as the famous bandit Gaspare and goes to see the mayor. The mayor, terrified, flees from "Gaspare" and commits a series of ridiculous acts, becoming the laughing stock of the whole town.

With a certain degree of audacity, Girardi from Graz manages to gain a foothold at the Strampfertheater, a well-attended traditional theater in Vienna. However, his engagement as a new comedian leads to fierce competition with the theater's established star, Felix Schweighofer. Girardi's plans to entertain the audience at a high level are ultimately crowned with success, even though he is long underrated. He is hired by the Theater an der Wien, where, during rehearsals for a new operetta, he even persuades the strict Johann Strauss to compose an additional waltz for him. Girardi distills his special brand of comedy from events beyond the stage, from his own experiences. Confidently, the actor rises to become a favorite with the audience, against all odds. All of Vienna is enthusiastic about Girardi, singing his songs and applauding his shows.