| 186 | Iron Man (1st Series) | 1st Appearance of Vibro (Alton Viberaux); Origin of Vibro (Alton Viberaux); Versus Vibro; No credits in issue |
| 186/NS | Iron Man (1st Series) | 1st Appearance of Vibro (Alton Viberaux); Origin of Vibro (Alton Viberaux); Versus Vibro; No credits in issue |
| 186 | Iron Man (1st Series, Canadian Edition) | 1st Appearance of Vibro; Origin of Vibro; Versus Vibro; No credits in issue; Credits here assumed from prior and subsequent issues |