主演：Walter Miller Eugenia Gilbert Robert Walker Eugene Burr Dorothy Tallcot James A. Fitzgerald C.H. Allen Ray Childs Alfred Hewston Arthur Morrison Hamilton Morse Hugh Blair
主演：Silver Streak 马尔科姆·麦克格雷戈 Louise Lorraine George B. Williams Albert J. Smith 安德斯·兰道夫 Edith Yorke Arthur Morrison 罗伯特·沃克 Dorothy Tallcot Thur Fairfax Hughie Mack
简介：A scientist has invented a silent airplane motor of tremendous potential benefit to aeronautical and military concerns...