| Issue | #73 |
| Published | December 1971 |
| Cover Price | 0.20 USD |
| Pages | 36 |
| Editing | Stan Lee |
| Genre | superhero |
| Pencils | Bill Everett |
| Inks | Bill Everett |
| Reprinted | in Marvel Masterworks: The X-Men (Marvel, 2003 series) #7; in Essential Classic X-Men (Marvel, 2006 series) #3 [black & white] |
| Genre | superhero |
| Script | Roy Thomas |
| Pencils | Werner Roth |
| Inks | Dick Ayers |
| Letters | Sam Rosen |
| Reprinted | from X-Men (Marvel, 1963 series) #25 |