In early 1933, at age 18, Hedy Kiesler, still working under her maiden name, was given the lead in Gustav Machatý's film Ecstasy (Ekstase in German, Extase in Czech). She played the neglected young wife of an indifferent older man.
Kiesler also played a number of stage roles, including a starring one in Sissy, a play about Empress Elisabeth of Austria produced in Vienna in early 1933, just as Ecstasy premiered. It won accolades from critics.
On August 10, 1933, at the age of 18, Kiesler married Mandl, then 33. The son of a Jewish father and a Catholic mother, Mandl insisted that she convert to Catholicism before their wedding in Vienna Karlskirche. In her autobiography Ecstasy and Me, Mandl is described as an extremely controlling husband. He strongly objected to her having been filmed in the simulated orgasm scene in Ecstasy and prevented her from pursuing her acting career. She claimed she was kept a virtual prisoner in their castle home, Castle Schwarzenau [de] in the remote Waldviertel near the Czech border.