The Greatest Power

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.

• Edwin CareweDirector
• Edward LeSaintDirector

• Ethel BarrymoreMiriam Monroe
• William B. DavidsonJohn Conrad
• Harry NorthrupAlbert Bernard (as Harry S. Northrup)
• Frank CurrierRandolph Monroe
• William BlackBradford Duncan
• Cecil OwenEric Johansen
• Frederick TruesdellProf. Poole (as Fred C. Truesdell)
• Redfield ClarkeMaj. Gen. Foster (as Redfield Clark)
• Rudolph De CordovaWilliams
• W.M. ArmstrongCapt. Herbert