 Arden's film career began in earnest in 1937 when she signed a contract with RKO Radio Pictures and appeared in the films "Oh Doctor" and "Stage Door".Her "Stage Door" portrayal of a fast-talking, witty supporting character gained Arden considerable notice and was a template for many of Arden's future roles.In 1938, she played a supporting part in the comedy "Having Wonderful Time", starring Ginger Rogers and Lucille Ball.