| Issue | #21 |
| Published | January 1970 |
| Cover Price | 0.15 USD |
| Pages | 36 |
| Editing | Stan Lee |
| Characters | Iron Man |
| Genre | superhero |
| Pencils | George Tuska |
| Inks | Mike Esposito |
| Characters | Crimson Dynamo [Alex Niven, Alex Nevsky]; Eddie March [also as Iron Man]; Hammer; Happy Hogan; Iron Man; Janice Cord |
| Synopsis | Tony Stark, with an ailing heart, seeks a replacement. Boxer Eddie March becomes the new Iron Man but he also has potentially life-threatening health problems. In a battle with the powerful Crimson Dynamo the "old" Iron Man has to come to the rescue of the "new" one. |
| Genre | superhero |
| Script | Archie Goodwin |
| Pencils | George Tuska |
| Inks | Mike Esposito [as Joe Gaudioso] |
| Letters | Jean Izzo |
| Script | various |
| Letters | typeset |