What actors and actresses appeared in Der Hauptmann und sein Held - 1955?

The film you're referring to, "Der Hauptmann und sein Held," is actually called "Der Hauptmann von Köpenick" (The Captain of Köpenick) and was released in 1956, not 1955.

Here are the main actors and actresses who appeared in the film:

* Heinz Rühmann as Wilhelm Voigt, the "Captain of Köpenick"

* Carl Raddatz as the Police Commissioner

* Paul Dahlke as the Mayor

* Camilla Spira as Frau Voigt

* Werner Peters as the Lieutenant

* Hans Söhnker as the Sergeant

* Hans Nielsen as the Officer

* Inge Meysel as the Landlady

The film was a major success in Germany and is still considered a classic of German cinema.