July 15, 1937, Cromwell guest-starred on The Royal Gelatin Hour hosted by Rudy Vallee, in a dramatic skit opposite Fay Wray. Enjoying the experience, Cromwell had his agent secure for him an audition for the role of Kit Marshall on the soap opera Those We Love, first on NBC Radio and then on CBS Radio. As a regular on the Monday night program which ran from 1938 until 1942, Cromwell played opposite Nan Grey; Grey played Kit's twin sister, Kathy. Late 1930s In the late 1930s, Cromwell appeared in Storm Over Bengal, for Republic Pictures, in order to capitalize on the success of The Lives of a Bengal Lancer. Aside from the aforementioned standout roles in Jezebel and The Lives of a Bengal Lancer, Cromwell did another notable turn as defendant Matt Clay to Henry Fonda's title-performance in Young Mr. Lincoln (1939). In 1939, Cromwell again tried his luck on the stage in a regional production of Sutton Vane's play Outward Bound, featuring Dorothy Jordan as his co-star. 1940s and military service In the early 1940s, Universal Pictures released Enemy Agent starring Cromwell as a draftsman who thwarts the Nazis. In 1942, he went on to appear in marginal but still watchable fare such as Baby Face Morgan, which co-starred Mary Carlisle. Cromwell enjoyed a career boost, if not a critically acclaimed performance, in the film adaptation of the hit radio serial: Cosmo Jones, Crime Smasher (1943), opposite Gale Storm. Next up at Monogram Pictures, he was cast as a doctor working covertly for a police department to catch mobsters in the forgettable though endearing Riot Squad, wherein his "fiancée", Rita Quigley, breaks their engagement. Cromwell served during the last two years of World War II with the United States Coast Guard. Upon returning to California following the war's end, Cromwell acted in local theater productions. He also signed on for live performances in summer stock in the East during this period. Cromwell's break from films due to his stint in the Service meant that he was not much in demand after the War's end, and he retired from films after his comeback fizzled. His last role was in a noir flick of 1948, Bungalow 13. All told, Cromwell's film career spanned 39 films. Personal life Back in California for good, Cromwell was married once, briefly (1945–1946), to actress Angela Lansbury, when she was 19 and Cromwell was 35. Cromwell