| Release: | May 1974 |
| Cover: | May 1974 |
The Sins of the Secret Empire!
| Release: | May 1974 |
| Cover: | May 1974 |
Professor X believes that the Secret Empire have been capturing mutants to further their cause. Captain American and the Falcon agree to join the remaining X-Men in a gambit to infiltrate and eliminate the operation.
| Writer | Steve Englehart |
| Cover Penciller | Gil Kane |
| Cover Inker | Frank Giacoia |
| Penciller | Sal Buscema |
| Inker | Vince Colletta |
| Colorist | George Roussos |
| Letterer | Artie Simek |
| Editor | Roy Thomas |
| Editor in Chief | Roy Thomas |
| Captain America | Steve Rogers |
| Beast | Henry 'Hank' McCoy |
| Cyclops | Scott Summers |
| Professor X | Charles Francis Xavier |
| Nicholas 'Nick' Fury Sr. | |
| Magneto | Max / Erik Magnus Eisenhardt / Lehnsherr |
| Falcon | Sam Wilson |
| Marvel Girl | Jean Grey |
| Timothy 'Dum Dum' Dugan | |
| Gabe Jones | |
| Secret Empire | |
| Linda Donaldson |
| Age | Bronze Age |
|---|---|
| Format | Digital |
| Series Group | Captain America |
| Genre | Action | Adventure | Super-Heroes |
| No. of Pages | 32 |
| Country | USA |
| Language | English |