| Issue | #51 |
| Published | July 1977 |
| Cover Price | 0.30 |
| Pages | 36 |
| Editing | Archie Goodwin |
| Genre | superhero |
| Pencils | Al Milgrom |
| Inks | Al Milgrom |
| Letters | Irving Watanabe |
| Characters | Mercurio; Avengers (appearance) |
| Genre | superhero |
| Script | Scott Edelman |
| Pencils | Al Milgrom |
| Inks | Terry Austin, Al Milgrom (page 10, panel 3) |
| Colors | Irene Vartanoff |
| Letters | Gaspar Saladino (page one), Joe Rosen |
| Reprinted | in Mighty World of Marvel, The (Marvel UK, 1972 series) #288 [7 pp., as "Enter... The 4-D Man!"] |