A distinguished young Naval officer from a celebrated military falls prey to a terrorist and his seductress accomplice bent on destroying the Panama Canal.

Edmund Lowe
as Capt. Decatur

Alma Tell
as Mrs. Richard Decatur

Martha Mansfield
as Peg Williams, the vamp

Bela Lugosi
as Hisston

Betty Jewel
as Dolores

Carl Harbaugh
as Menchen

Martin Faust
as Cordoba

Gordon McEdward
as Gridley Nevins

Byron Douglas
as Adm. Nevins

Theodore Babcock
as Adm. Meade