Maj. Phillip Waring
Helen Lane
Lia Maing
Tommy Young
Murdock
Arlie Johnson
Sun
Loring
Sam
Pilot
Jimmy
Marlin (as William von Brincken)
Lt. Everett
Eli Maing
Baird
Khantow
Clerk
Captain Lacey
Foreign Spies Exposed! Canal Defense Saved!
A U.S. agent attempts to track down a spy ring working to destroy the Panama Canal.
