Secret Agent X-9 9 comic books
| 1 in stock | Secret Agent X-9 (1934 McKay) | #1-2 | David McKay Publishing | 1934 |
| 1 in stock | Secret Agent X-9 (1936 Whitman BLB) | 1144 | Whitman | 1936 |
| 1 in stock | Secret Agent X-9 (Nostalgia Press) | 1976 | 1976 | |
| 1 in stock | Secret Agent X-9 and the Mad Assassin (1938 Whitman BLB) | 1472 | Whitman | 1938 |
| 1 in stock | Secret Agent X-9 Feature Book (1937 McKay) | #8 | David McKay Publishing | 1937 |
| 1 in stock | Secret Agent X-9: The Fixer (1980 Pacific Comics Club) | #1 | Pacific Comics Club | 1980 |
