“An Incredible Battle Is Raging Right Under Your Feet!”
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
