Marvel
| Name | Super Name | Code | Actions |
|---|---|---|---|
| Master Mind Excello | Master Mind Excello | Master… | Show |
| Mastermind (Jason Wyngarde) | Mastermind | Master… | Show |
| Mastermind (Martinique Jason) | Mastermind | Master… | Show |
| Master Mold | Master Mold | Master… | Show |
| Master of the World | Master of the World | Master… | Show |
| Master Pandemonium | Master Pandemonium | Master… | Show |
| Matador | Matador | Matador | Show |
| Match | Match | Match | Show |
| Mathemanic | Mathemanic | Mathem… | Show |
| Matsu'o Tsurayaba | Matsu'o Tsurayaba | Matsu-… | Show |
| Matthew Risman | Matthew Risman | Matthe… | Show |
| Mauler | Mauler | Mauler | Show |
| Mauvais | Mauvais | Mauvais | Show |
| Maverick (Chris Bradley) | Maverick | Maveri… | Show |
| Maximus | Maximus | Maximus | Show |
| Maximus Lobo | Maximus Lobo | Maximu… | Show |
| Mayhem | Mayhem | Mayhem | Show |
| Medusa | Medusa | Medusa | Show |
| Meggan | Meggan | Meggan | Show |
| Melter | Melter | Melter | Show |