Watch Showbiz Goes to War for Free: How to Stream the Movie Online at 123Movies. . While a few Hollywood celebrities such as James Stewart and Clark Gable saw combat during World War II, the majority used their talents to rally the American public through bond sales, morale-boosting USO tours, patriotic war dramas and escapist film fare. Comedian David Steinberg plays host for this star-studded, 90-minute documentary, which looks at the way Tinseltown helped the United States' war effort.