크레딧 출연 휴 말로 Dr. Russell A. Marvin Joan Taylor Carol Marvin Donald Curtis Maj. Huglin Morris Ankrum Brig. Gen. John Hanley Thomas Browne Henry Vice Adm. Enright Grandon Rhodes Gen. Edmunds John Zaremba Prof. Kanter Paul Frees Alien (voice) Frank Wilcox Alfred Cassidy Sydney Mason Frank the garage man Larry J. Blake Motorcycle cop Bert Stevens Air Intelligence Command Officer Forbes Murray Military Officer at Experiment Arthur Tovey Officer/Civilian at Military Conference Alan Wells Major Kimberly Nicky Blair Military Officer at Experiment (uncredited) Jimmy Cross Military Messenger (uncredited) Jack Deery Military Officer (uncredited) Charles Evans Dr. Alberts (uncredited) Raoul Freeman Military Official (uncredited) Paul Frees Alien (voice) (uncredited) James Gonzalez Military Official (uncredited) Duke Green Minor Role (uncredited) Ed Haskett Military Official (uncredited) Clark Howat Sgt. Nash (uncredited) Harry Lauter Cutting - Generator Technician (uncredited) Don Marlowe Minor Role (uncredited) William Meader Worker in Control Tower (uncredited) Sol Murgi Plane Passenger (uncredited) Forbes Murray Military Officer at Experiment (uncredited) William J. O'Brien Radio Listener (archive footage) (uncredited) Murray Pollack Plane Passenger (uncredited) Mike Ragan Tank Commander (uncredited) Alan Reynolds Maj. Kimberly (uncredited) Dale Van Sickel Man Crushed Beneath Wall (uncredited) Guy Way Civilian Observing Saucer Attack (uncredited) Bob Whitney Plane Passenger (uncredited) Frank Wilcox Alfred Cassidy (uncredited) Beal Wong Chinese Radio Listener (uncredited) William Woodson Narrator (voice) (uncredited) 스텝 George Worthing Yates Writing Fred F. Sears Directing Donald E. Keyhoe Writing Curt Siodmak Writing Bernard Gordon Writing Ray Harryhausen Visual Effects Danny B. Landres Editing Charles H. Schneer Production Russ Kelley Crew J.S. Westmoreland Sound Jack Erickson Production Paul Palmentola Art Leon Chooluck Production Sam Katzman Production Sidney Clifford Art Fred Jackman Jr. Camera Gene Anderson Jr. Directing