| Issue | #21 |
| Published | December 1986 |
| Cover Price | 0.75 |
| Pages | 36 |
| Editing | Jim Shooter (editor-in-chief), Jim Owsley |
| Characters | Spider-Man, Spider-Man imposter |
| Genre | superhero |
| Letters | Phil Felix |
| Characters | Spider-Man, Joy Mercado, J. Jonah Jameson, Joe (Robbie) Robertson, Mary Jane Watson, Spider-Man imposter |
| Synopsis | While on a ferry to Ireland, Peter Parker remembers thwarting a Spider-Man imposter several months previously |
| Genre | superhero |
| Script | Larry Lieber |
| Pencils | Larry Lieber |
| Inks | Vince Colletta |
| Colors | Bob Sharen |
| Letters | Rick Parker |