Secret Agent X-9 is a 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. Both sides in World War II attempt to control the secret of element 722, which can be used to create cheap aviation fuel. Secret Agent X-9 was based on the comic strip Secret Agent X-9 by Leslie Charteris and others. It was Universal's last comic strip adaptation .
| Release date: | 1945 |
| Directed by: | Lewis D. Collins, Ray Taylor |
| Runtime: | 246 Minutes |
| Editor: | Alvin Todd |
| Music by: | Paul Sawtell |
| Cinematography: | Maury Gertsman |
| Screenplay by: | Joseph O'Donnell, Patricia Harper |
| Adapted from: | Secret Agent X-9 |
| Genre: | Adventure, Action |