Writing
Zero Hour! was an adaptation of Hailey's original 1956 Canadian Broadcasting Corporation teleplay Flight into Danger, starring James Doohan as George Spencer, the original name for the Stryker character.[4] Hailey also co-wrote a novel with John Castle based on the same plot titled Flight Into Danger: Runway Zero-Eight (1958), although this is based more closely on the television version than on the film.
Filming
Principal photography took place from May 8–28, 1957, with retakes on July 23–24, 1957. The primary filming location was Santa Ana, California.[5] Nightclub and television performer Peggy King made her feature film debut in Zero Hour!, recording the song "Zero Hour" for Columbia Records to coincide with the film's release.[1][Note 1]
John Ashley has a small role appearing on television as a pop star, although the vocals were provided by Duke Mitchell.[6]
