Government officials discover a horrible plot: the Chinese are tunneling their way to the United States.
Cmdr. Jonathan Shaw
Tila Yung
Adm. Felix Hillebrand
Arnold Kramer
Sgt. Marvin Mulberry
Gen. Chan Lu
Dr. Kengh Lee
Sgt. Seth Hawkins
Maj. Frank Cannon
Lt. Cmdr. Vance Cassidy (as Edward Bishop)
