| Release: | Jan 1969 |
| Cover: | Jan 1969 |
Twilight of the Mutants / The Crimes of the Conquistador
| Release: | Jan 1969 |
| Cover: | Jan 1969 |
Twilight of the Mutants - Erik the Red has taken control of Magneto's army, and may be a greater threat than Magneto ever was. Iceman is doing some investigation of his own while the rest of the team puts Cyclops' plan into action.
The Crimes of the Conquistador - The Conquistador has sent Hank McCoy on a criminal mission, while the X-Men rush to intervene.
| Writer | Arnold Drake |
| Cover Penciller | Marie Severin |
| Cover Inker | Joe Sinnott |
| Penciller | Werner Roth, Don Heck |
| Inker | John Tartaglione |
| Letterer | Sam Rosen |
| Editor | Stan Lee |
| Beast | Henry 'Hank' McCoy |
| Cyclops | Scott Summers |
| Iceman | Robert 'Bobby' Drake |
| Angel | Warren Worthington III |
| Marvel Girl | Jean Grey |
| Polaris | Lorna Dane |
| Mesmero | Vincent |
| Erik the Red | Scott Summers |
| Age | Silver Age |
|---|---|
| Format | Digital |
| Series Group | X-Men |
| Genre | Action | Adventure | Super-Heroes |
| No. of Pages | 32 |
| Country | USA |
| Language | English |