El ángel azul
Sternberg was summoned to Berlin by Paramount's sister studio, UFA in 1929 to direct Emil Jannings in his first sound production, "The Blue Angel". It would be "the most important film" of Sternberg's career. Sternberg cast the then little-known Marlene Dietrich as Lola Lola, the female lead and nemesis of Jannings character Professor Immanuel Rath, whose passion for the young cabaret singer would reduce him to a "spectacular cuckold." Dietrich became an international star overnight and followed Sternberg to Hollywood to produce six more collaborations at Paramount. Film historian Andrew Sarris contends that "The Blue Angel" is Sternberg's "most brutal and least humorous" work of his oeuvre and yet the one film that the director's "most severe detractors will concede is beyond reproach or ridicule ... "The Blue Angel" stands up today as Sternberg's most efficient achievement ..."