- Country: USA
- Genres: Drama
- Release: 1917-06-18
- Director: Edwin Carewe , Edward LeSaint
- Writers: Albert S. Le Vino , Louis Wolheim (1880–1931)
- Language: None | English
- Stars: Ethel Barrymore , William B. Davidson , Harry Northrup , Frank Currier , William Black , Cecil Owen , Frederick Truesdell , Redfield Clarke , Rudolph De Cordova , W.M. Armstrong
- Runtime: 50 min
- Awards: N/A
- AKA: The Greatest Power , The Greatest Power (United Kingdom) , Her Greatest Power (United States of America) , The Greatest Power (United States of America)
- Plot: 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. When Conrad points out to her that its use could bring about world peace, Miriam works with him to perfect the formula. After Miriam's father, the head of a great corporation, receives news that the country is threatened by war, he and his partner, Albert Bernard, consider exonite for government use but Conrad, still professing peace, refuses to give up his formula for the purposes of war. Miriam, refusing to take no for an answer, steals into the lab to procure the formula, where she finds Bernard, actually a German spy, attempting to obtain the chemical for his government. After a struggle, Bernard is captured by secret service agents, and Conrad agrees to give the formula to his country.
- IMDB:tt0008033
The Greatest Power Cast · · · ALL
Edwin Carewe
Director
Edward LeSaint
Director
Ethel Barrymore
Miriam Monroe
William B. Davidson
John Conrad
Harry Northrup
Albert Bernard (as Harry S. Northrup)
Frank Currier
Randolph Monroe
William Black
Bradford Duncan
Frederick Truesdell
Prof. Poole (as Fred C. Truesdell)