Miriam Monroe
Ethel Barrymore
Miriam Monroe

Miriam Monroe and John Conrad are two young scientific workers who, independently of each other, have discovered a chemical called exonite. Miriam discovered it while searching for a cure for cancer, while Conrad used it as a basis for a powerful explosive.
Miriam Monroe
Ethel Barrymore
Miriam Monroe
John Conrad
William B. Davidson
John Conrad
Albert Bernard (as Harry S. Northrup)
Harry Northrup
Albert Bernard (as Harry S. Northrup)
Randolph Monroe
Frank Currier
Randolph Monroe
Bradford Duncan
William Black
Bradford Duncan
Eric Johansen
Cecil Owen
Eric Johansen
Prof. Poole (as Fred C. Truesdell)
Frederick Truesdell
Prof. Poole (as Fred C. Truesdell)
Maj. Gen. Foster (as Redfield Clark)
Redfield Clarke
Maj. Gen. Foster (as Redfield Clark)
Williams
Rudolph De Cordova
Williams
Capt. Herbert
W.M. Armstrong
Capt. Herbert
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