Nielsen began her film career in 1909, starring in director Urban Gad's 1910 tragedy "Afgrunden" ("The Abyss"). Nielsen's minimalist acting style was evidenced in her successful portrayal of a naive young woman lured into a tragic life. Her overt sexuality in the film's "gaucho dance" scene established the erotic quality for which Nielsen became known. Because of the film's success, Nielsen continued to act in cinema rather than on stage. Nielsen and Gad married, then made four more films together. The explosion of Nielsen's popularity propelled Gad and Nielsen to move from Denmark to Germany where she was provided her own film studio and the opportunity for greater profits.