Government officials discover a horrible plot: the Chinese are tunneling their way to the United States.
Kerwin Mathews
Cmdr. Jonathan Shaw
Viviane Ventura
Tila Yung
Robert Ayres
Adm. Felix Hillebrand
Peter Arne
Arnold Kramer
Al Mulock
Sgt. Marvin Mulberry
Martin Benson
Gen. Chan Lu
Peter Elliott
Dr. Kengh Lee
Earl Cameron
Sgt. Seth Hawkins
John Brandon
Maj. Frank Cannon
Ed Bishop
Lt. Cmdr. Vance Cassidy (as Edward Bishop)
Bill Nagy
Col. Talbot Wilson
Sarah Brackett
Meg Webson
Paula Li Shiu
Dr. Arnn
David Spenser
Maj. Chai
Michael McStay
Bomb Train Commander
Carl Jaffe
Dr. Galissi
Norma West
Susan Kramer
Larry Cross
Broadcaster
Bessie Love
Matron
Bee Duffell
Matron's Friend
Bill Hutchinson
Lanchek
Martin Terry
Mine Foreman
Frank Lieberman
Police
Roy Pattison
Chela Matthison
Nurse
Montgomery Tully
Director
Charles Reynolds
Producer
Nov 1, 1959
Jan 1, 1966
Jan 21, 2001
Jul 10, 1993
Jun 19, 1997
Sep 10, 1959
Aug 6, 1979
Apr 25, 1945
Oct 17, 1999
Feb 9, 2007
Feb 12, 2021
Apr 26, 2013
Dec 25, 2006
Apr 6, 1936
Nov 8, 2019
Jun 25, 2025
Metro-Goldwyn-Mayer British Studios
GB
Reynolds-Vetters Productions Ltd.
United Kingdom
English