| Issue | #37 |
| Published | October 1967 |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Stan Lee |
| Notes | Disputed penciler and inker credits--Don Heck pencils, Jack Kirby layouts, and George Roussos inks per Rich Donnelly; Don Heck pencils and inks per Steve Whitaker, Bob Ford, and Nick Caputo (uncertain); Ross Andru pencils and Don Heck inks per Carl Gafford. |
| Genre | superhero |
| Pencils | Don Heck? |
| Inks | Don Heck? |
| Notes | Disputed penciler and inker credits--Don Heck pencils, Jack Kirby layouts, and George Roussos inks per Rich Donnelly; Don Heck pencils and inks per Steve Whitaker, Bob Ford, and Nick Caputo (uncertain); Ross Andru pencils and Don Heck inks per Carl Gafford. |
| Reprinted | in X-Men (Marvel, 1963 series) #85 |
| Genre | superhero |
| Script | Roy Thomas |
| Pencils | Ross Andru |
| Inks | Don Heck |
| Letters | Artie Simek |
| Notes | GA: Banshee; V: Mutant-Master (I), Changeling, Vanisher, Blob, Unus, Mastermind (all Factor Three) |
| Reprinted | in X-Men (Marvel, 1963 series) #85; in Marvel Special (Marvel Italia, 1994 series) #14 |