| Issue | #11 |
| Published | October 1980 |
| Cover Price | 0.50 USD |
| Pages | 36 |
| Genre | superhero |
| Pencils | Al Milgrom |
| Inks | Al Milgrom |
| Letters | Irving Watanabe |
| Characters | Sub-Mariner; Evil Mutants; X-Men; Prof X |
| Genre | superhero |
| Script | Stan Lee; Jack Kirby |
| Pencils | Jack Kirby |
| Inks | Chic Stone |
| Letters | Sam Rosen |
| Editing | Stan Lee |
| Reprinted | from X-Men (Marvel, 1963 series) #6 |
| Characters | X-Men, Fantastic Four, Mad Thinker's Android |
| Genre | superhero |
| Pencils | Jack Kirby |
| Inks | Chic Stone? |
| Letters | Irving Watanabe |
| Notes | This sequence added 2005 by Steven Tice. |
| Reprinted | from Fantastic Four (Marvel, 1961 series) #28 |
| Characters | Beast |
| Genre | superhero |
| Script | Arnold Drake |
| Pencils | Werner Roth |
| Inks | John Verpoorten |
| Colors | Irving Watanabe |
| Editing | Stan Lee |
| Notes | Explanation of the Beast's powers |
| Reprinted | from X-Men (Marvel, 1963 series) #48 |
| Characters | X-Men, Spider-Man |
| Genre | superhero |
| Pencils | Dan Adkins? |
| Inks | Dan Adkins |
| Letters | Irving Watanabe |
| Notes | See the X-Men #35 index for details on the cover art credits. The lettering is new. This sequence added 2005 by Steven Tice. |
| Reprinted | from X-Men (Marvel, 1963 series) #35 [cover] |