Secret Agent X-9 is a 1945 Universal movie serial based on the comic strip Secret Agent X-9. It was the second serial with this name, the first was released by Universal in 1937.

Plot
On a neutral island in the Pacific called Shadow Island (above the island of Formosa), run by American gangster Lucky Kamber, both sides in World War II attempt to control the secret of element 722, which can be used to create synthetic aviation fuel.

Cast
Lloyd Bridges as Phil Corrigan aka Secret Agent X-9
Keye Luke as Ah Fong, Chinese agent
Jan Wiley as Lynn Moore, Australian agent
Victoria Horne as Nabura, villainous Japanese agent
Samuel S. Hinds as Solo
Cy Kendall as Lucky Kamber, self-proclaimed governor of the neutral Shadow Island
Jack Overman as Marker
George Lynn as Bach, one of Nabura’s henchmen
Clarence Lung as Takahari, one of Nabura’s henchmen
Benson Fong as Dr. Hakahima
Arno Frey as Kapitan Grut, Nazi captain
Ferdinand Munier as Papa Pierre Dupray
Ann Codee as “Mama Pierre” Dupray
Edward Howard as Drag Dorgan