| Mountain | 440 |
| Moonstone, Harsh Mistress | 447 |
| Moonstone, Harsh Mistress (12 variants) | 107 |
| Moon Girl and Devil Dinosaur (8 variants) | 421 |
| Moon Girl and Devil Dinosaur (12 variants) | 223 |
| Monica Rambeau // Photon, Living Light (12 variants) | 356 |
| Monica Rambeau // Photon, Living Light (12 variants) | 23 |
| Monica Rambeau // Photon, Living Light (12 variants) | 345 |
| Mole Man, Moloid Master (12 variants) | 177 |
| Mole Man, Moloid Master (8 variants) | 415 |
| Mockingbird, Ace Agent (12 variants) | 22 |
| Mjölnir, Hammer of Thor (12 variants) | 146 |
| Mjölnir, Hammer of Thor (12 variants) | 339 |
| Mjölnir, Hammer of Thor (12 variants) | 303 |
| Misty Knight, Hero for Hire (12 variants) | 145 |
| Mister Hyde, Monster Within (12 variants) | 176 |
| Mister Fantastic, Reed Richards | 445 |
| Mister Fantastic, Reed Richards (12 variants) | 320 |
| Mister Fantastic, Reed Richards (12 variants) | 66 |
| Madame Masque (12 variants) | 104 |
| Madame Hydra | 451 |
| Madame Hydra (12 variants) | 221 |
| Madame Hydra (12 variants) | 318 |
| Machinesmith Automaton (12 variants) | 144 |
| M.O.D.O.K. (12 variants) | 106 |
| M.O.D.O.K. (8 variants) | 408 |
| Luke Cage, Power Man (12 variants) | 20 |
| Los Diablos Missile Base (12 variants) | 270 |
| Loki, God of Mischief (12 variants) | 343 |
| Loki, God of Mischief (12 variants) | 65 |
| Loki Laufeyson (12 variants) | 143 |
| Lightning Strike (12 variants) | 142 |
| Leader, Super-Genius (12 variants) | 330 |
| Leader, Super-Genius (12 variants) | 64 |
| Kree Sentinel (12 variants) | 141 |
| Kree Commandos (12 variants) | 19 |
| Knight of Wundagore (12 variants) | 175 |
| Klaw, Sonic Subjugator (12 variants) | 103 |
| Kingpin's Enforcers (12 variants) | 102 |
| King T'Challa // Black Panther, Hope Enduring (12 variants) | 346 |
| King T'Challa // Black Panther, Hope Enduring (12 variants) | 219 |
| King T'Challa // Black Panther, Hope Enduring | 399 |
| King T'Challa // Black Panther, Hope Enduring (12 variants) | 373 |
| Killmonger, Scourge of Wakanda (12 variants) | 218 |
| Kid Loki (12 variants) | 63 |
| Kang, Temporal Tyrant | 450 |
| Kang, Temporal Tyrant (12 variants) | 217 |
| Kang the Conqueror (8 variants) | 403 |
| Kang the Conqueror (12 variants) | 62 |
| Ka-Zar of the Savage Land (12 variants) | 174 |