| Issue | #26 |
| Published | November 1966 |
| Cover Price | 0.12 |
| Pages | 36 |
| Editing | Stan Lee |
| Notes | Disputed penciler credit--Werner Roth alone per the original indexer; Werner Roth with an assist on the Kulkulkan figure by Jack Kirby per Steve Whitaker, Nick Caputo, Carl Gafford, and Michael Evans. |
| Characters | The X-Men (Cyclops, Angel, Beast, Iceman); Kukulcan |
| Genre | superhero |
| Pencils | Werner Roth; Jack Kirby (Kulkulkan assist) |
| Inks | Dick Ayers |
| Notes | Disputed penciler credit--Werner Roth alone per the original indexer; Werner Roth with an assist on the Kulkulkan figure by Jack Kirby per Steve Whitaker, Nick Caputo, Carl Gafford, and Michael Evans. |
| Characters | F: The X-Men (Professor X, Cyclops, Marvel Girl, Angel, Beast, Iceman); V: Kukulcan; GA: Calvin Rankin (The Mimic); Ted Roberts |
| Genre | superhero |
| Script | Roy Thomas |
| Pencils | Werner Roth |
| Inks | Dick Ayers |
| Letters | Sam Rosen |
| Reprinted | in X-Men (Marvel, 1963 series) #74; in Marvel Special (Marvel Italia, 1994 series) #10 |