| Infinity Formula (8 variants) | 601 |
| Ingenious Smith (12 variants) | 135 |
| Inner Demons Gangsters (8 variants) | 797 |
| Inspired Fire (8 variants) | 690 |
| Into the Time Vortex (4 variants) | 363 |
| Into the Time Vortex (12 variants) | 165 |
| Intrepid Ace (8 variants) | 691 |
| Invisible Force Field (12 variants) | 19 |
| Invisible Force Field (4 variants) | 311 |
| Invisible Woman | 875 |
| Invisible Woman (8 variants) | 1 |
| Iron Fist, Hero for Hire (8 variants) | 692 |
| Iron Lad, Young Avenger (12 variants) | 569 |
| Iron Man, Armored Avenger (12 variants) | 33 |
| Iron Man, Armored Avenger (4 variants) | 332 |
| Iron Man, Bleeding Edge (8 variants) | 626 |
| Iron Man, Futurist Paragon (8 variants) | 501 |
| Iron Man, Modern Marvel (12 variants) | 830 |
| Iron Man, Tony Stark (6 variants) | 851 |
| Iron Monger, Sadistic Tycoon (4 variants) | 350 |
| Iron Monger, Sadistic Tycoon (12 variants) | 45 |
| Iron Suitcase (8 variants) | 750 |
| Irrigated Farmland (12 variants) | 251 |
| Irrigated Farmland (4 variants) | 481 |
| It's Clobberin' Time! (4 variants) | 381 |
| It's Clobberin' Time! (12 variants) | 66 |
| Jack of Hearts, Volatile Hero (8 variants) | 693 |
| Jarvis, Earth's Mightiest Butler (4 variants) | 333 |
| Jarvis, Earth's Mightiest Butler (12 variants) | 34 |
| Jocasta, Automaton Avenger (12 variants) | 108 |
| Jocasta, Automaton Avenger (4 variants) | 439 |
| Kang Dynasty (12 variants) | 35 |
| Kang Prime (4 variants) | 406 |
| Kang Prime (12 variants) | 85 |
| Karolina Dean, Runaway (8 variants) | 694 |
| Killmonger, Ruthless Usurper (12 variants) | 53 |
| Killmonger, Ruthless Usurper (4 variants) | 364 |
| Kimoyo Beads (4 variants) | 440 |
| Kimoyo Beads (12 variants) | 109 |
| Kindred Discovery (4 variants) | 334 |
| Kindred Discovery (12 variants) | 150 |
| Kindred Dominance (4 variants) | 351 |
| Kindred Dominance (12 variants) | 156 |
| King Solomon's Frogs (4 variants) | 312 |
| King Solomon's Frogs (12 variants) | 20 |
| Kingpin, Wilson Fisk (8 variants) | 661 |
| Klaw, Master of Sound (4 variants) | 352 |
| Klaw, Master of Sound (12 variants) | 46 |
| Lady Loki, Agent of Chaos (4 variants) | 365 |
| Lady Loki, Agent of Chaos (12 variants) | 54 |