| 1 | 15-Love | 1st appearance of Mill Collins |
| 4 | 100 Bullets | 1st Appearance of Augustus Medici; 1st Appearance of Megan Dietrich |
| 24 | 100 Bullets | 1st Appearance of Mia Simone |
| 27 | 100 Bullets | 1st Appearance of Milo Garrett |
| 8 | 2001, A Space Odyssey | 1st appearance of Mister Machine (Aaron Stack); Origin of Mister Machine (Aaron Stack) |
| 8/A | 2001, A Space Odyssey | 1st Appearance of Machine Man (as Mister Machine) |
| 8 | 2001, A Space Odyssey (UK Edition) | 1st appearance of Mister Machine (Aaron Stack); Origin of Mister Machine (Aaron Stack) |
| 33 | Action Comics | 1st Appearance of Mister America; 1st appearance of Mr. America (Tex Thompson); Origin of Mister America; Origin of Mr. America (Tex Thompson) |
| 468 | Action Comics | 1st Appearance of Morgan Edge’s mother (Sophie Edelstein); Versus Terra-Man |
| 645 | Action Comics | 1st Appearance of Maxima; Versus Maxima; Continued in Superman #36 |
| 645/NS | Action Comics | 1st Appearance of Maxima; Versus Maxima; Continued in Superman #36 |
| 649 | Action Comics | 1st Appearance of Mara Talbot; Versus Brainiac; Brainiac Trilogy, Part 3; Braniac Trilogy, Part 3; Continued in Superman #33; Statement of Ownership, Management and Circulation for October 1, 1989 |
| 649/NS | Action Comics | 1st Appearance of Mara Talbot; Versus Brainiac; Brainiac Trilogy, Part 3; Braniac Trilogy, Part 3; Continued in Superman #33; Statement of Ownership, Management and Circulation for October 1, 1989 |
| 775 | Action Comics | [s]2001-13; 1st appearance of Coldcast (Nathan Craig Jones); 1st appearance of Elite; 1st appearance of Hat; 1st appearance of Manchester Black; 1st appearance of Menagerie; Giant-size |
| 775/NS | Action Comics | [s]2001-13; 1st appearance of Coldcast (Nathan Craig Jones); 1st appearance of Elite; 1st appearance of Hat; 1st appearance of Manchester Black; 1st appearance of Menagerie; Giant-size |
| 791 | Action Comics | 1st Appearance of Margaret Zabusky (Clark Kent’s Homecoming date); Death of Margaret Zabusky (Clark Kent’s Homecoming date); Plastic Man cameo; Superman |
| 791/NS | Action Comics | 1st Appearance of Margaret Zabusky (Clark Kent’s Homecoming date); Death of Margaret Zabusky (Clark Kent’s Homecoming date); Plastic Man cameo; Superman |
| 53 | Adventure Comics | 1st Appearance of Minuteman |
| 58 | Adventure Comics | 1st appearance of Manhunter (Paul Kirk) |
| 73 | Adventure Comics | 1st Appearance of Manhunter (Rick Nelson); 1st Manhunter by Simon & Kirby; Sandman |
| 303 | Adventure Comics | 1st Appearance of Matter-Eater Lad |
| 338 | Adventure Comics | 1st Appearance of Glorith; 1st Appearance of Glorith of Baaldur; 1st Appearance of Mitz Kem (Matter-Eater Lad’s mother); 1st Appearance of Rall Kem (Matter-Eater Lad’s father); Death of Glorith of Baaldur; Versus Glorith of Baaldur; Versus Time Trapper; Versus Time-Trapper; Reprint from Superboy (1st Series) #60 (Oct 1957); Tales of the Legion of Super-Heroes; Time Trapper VS Glorith. Superboy story from“Superboy” (Vol# 1) 60 1957; Time travel |
| 352 | Adventure Comics | 1st Appearance of Emerald Empress (Sarya/Fatal Five); 1st Appearance of Mano (Fatal Five); 1st Appearance of Persuader (Fatal Five); 1st Appearance of Tharok (Fatal Five); 1st Appearance of The Fatal Five; 1st Appearance of the Fatal Five; 1st Appearance of Validus (Garridan Ranzz/Fatal Five); Origin of Emerald Empress (Sarya/Fatal Five); Origin of Mano (Fatal Five); Origin of Tharok (Fatal Five); Origin of the Fatal Five; Versus Emerald Empress; Versus Fatal Five; Versus Mano; Versus Persuader; Versus Tharok; Versus the Fatal Five; Versus the Sun-Eater; Versus Validus; Irene Vartanoff L.O.C.; Legion; LSH story continued in Adventure Comics #353 (Feb 1967); Tales of the Legion of Super-Heroes; Time travel |
| 362 | Adventure Comics | 1st Appearance of King Voxv (Princess Projectra’s father); 1st Appearance of Mantis Morlo; Versus Mantis Morlo; Legion; LSH story continued in Adventure Comics #363 (Dec 1967); Tales of the Legion of Super-Heroes; Time travel |
| 369 | Adventure Comics | 1st Appearance of Leah Parker (Chief Parker’s wife); 1st Appearance of Mordru; 1st Appearance of Mordru the Merciless; Versus Mordru the Merciless; Legion in Smallville; LSH in Smallville; LSH story continued in Adventure Comics #370 (Jul 1968); Neal Adams inks on page one; Tales of the Legion of Super-Heroes; Time travel |
| 374 | Adventure Comics | 1st Appearance of Black Mace; 1st Appearance of Mystelor; 1st Appearance of Quanto; 1st Appearance of Rogarth; 1st Appearance of Shagrek; Versus Black Mace; Versus Mystelor; Versus Quanto; Versus Rogarth; Versus Shagrek; Legion |
| 79 | Adventures of Jerry Lewis, The | 1st Appearance of Mr. Yes |
| 8 | Agents of Atlas (2nd Series) | 1st Appearance of M-21; 1st Appearance of the Great Wall |
| 10 | Agents of Atlas (2nd Series) | 1st Appearance of Dr. Zu; 1st Appearance of M-1; 1st Appearance of M-3; 1st Appearance of M-5; 1st Appearance of M-8; 1st Appearance of M-12; 1st Appearance of Derek Schiller; 1st Appearance of Webb Terry |
| 1 | Age of X-Man Omega | 1st Appearance of Magneto (Age of X-Man); 1st Appearance of Solis (Age of X-Man); Age of X-Man tie-in; One-shot; Story continues in Uncanny X-Men Vol 5 #22 |
| 1/A | Age of X-Man Omega | 1st Appearance of Magneto (Age of X-Man); 1st Appearance of Solis (Age of X-Man); Age of X-Man tie-in; One-shot; Story continues in Uncanny X-Men Vol 5 #22 |
| 1 | Age of X-Man: The Marvelous X-Men | 1st Appearance of Fungus (bear) (Age of X-Man); 1st Appearance of Irene Schank (Age of X-Man); 1st Appearance of Isabelle (jackrabbit) (Age of X-Man); 1st Appearance of MUTV News (Age of X-Man); Age of X-Man tie-in; Story continued from Age of X-Men Alpha #1 |
| 1/A | Age of X-Man: The Marvelous X-Men | 1st Appearance of Fungus (bear) (Age of X-Man); 1st Appearance of Irene Schank (Age of X-Man); 1st Appearance of Isabelle (jackrabbit) (Age of X-Man); 1st Appearance of MUTV News (Age of X-Man); Age of X-Man tie-in |
| 1/B | Age of X-Man: The Marvelous X-Men | 1st Appearance of Fungus (bear) (Age of X-Man); 1st Appearance of Irene Schank (Age of X-Man); 1st Appearance of Isabelle (jackrabbit) (Age of X-Man); 1st Appearance of MUTV News (Age of X-Man); Age of X-Man tie-in; Story continued from Age of X-Men Alpha #1 |
| 1/C | Age of X-Man: The Marvelous X-Men | 1st Appearance of Fungus (bear) (Age of X-Man); 1st Appearance of Irene Schank (Age of X-Man); 1st Appearance of Isabelle (jackrabbit) (Age of X-Man); 1st Appearance of MUTV News (Age of X-Man); Age of X-Man tie-in; Story continued from Age of X-Men Alpha #1 |
| 1/D | Age of X-Man: The Marvelous X-Men | 1st Appearance of Fungus (bear) (Age of X-Man); 1st Appearance of Irene Schank (Age of X-Man); 1st Appearance of Isabelle (jackrabbit) (Age of X-Man); 1st Appearance of MUTV News (Age of X-Man); Age of X-Man tie-in; Story continued from Age of X-Men Alpha #1 |
| 3 | Age of X-Man: The Marvelous X-Men | 1st Appearance of Moebius (dog) |
| 2 | Airboy | 1st Appearance of Marisa; 1st Appearance of Skywolf (Golden Age; In modern era) |
| 10 | Airboy | 1st appearance of Manic |
| 25 | Airboy | 1st Appearance of Manure Man; Origin of Manure Man |
| 6 | Alias (Marvel) | 1st appearance of Malcom Powder |
| 9 | All-New Guardians of the Galaxy | 1st Appearance of Messihi; Death of Messihi |
| 9/A | All-New Guardians of the Galaxy | 1st Appearance of Messihi; Death of Messihi |
| 9/B | All-New Guardians of the Galaxy | 1st Appearance of Messihi; Death of Messihi |
| 1 | All-New Marvel Now! Point One | 1st Appearance of Ms. Marvel (Kamala Khan) |
| 1-2 | All-New Marvel Now! Point One | 1st Appearance of Ms. Marvel (Kamala Khan); All-New Marvel Now! |
| 1/B | All-New Marvel Now! Point One | 1st appearance of Ms. Marvel (Kamala Khan); Reprinting All-New Marvel Now! |
| 28 | All-New Wolverine | 1st Appearance of Fatima; 1st Appearance of Haruto; 1st Appearance of Maria |
| 28/A | All-New Wolverine | 1st Appearance of Fatima; 1st Appearance of Haruto; 1st Appearance of Maria |
| 11 | All-Select Comics | 1st appearance of Blonde Phantom (Louise Grant); 1st appearance of Mister Wu; Fall 1946 |
| 117 | All-Star Western (1st Series) | 1st appearance of Madame.44 (Jeanne Tane); 1st appearance of Super-Chief (Flying Stag) |
| 1 | Alpha Flight (1st Series) | 1st appearance of Tundra; 1st appearance of Puck; 1st appearance of Marrina; 1st appearance of Wildheart (not identified); 1st appearance of Diamond Lil (not identified); 1st appearance of Box (not identified); 1st appearance of Smart Alec (not identified); 1st appearance of Flashback (not identified); 1st appearance of Madison Jeffries (not identified); 1st appearance of Wild Child (not identified) |
| 1/NS | Alpha Flight (1st Series) | 1st appearance of Box (not identified); 1st appearance of Diamond Lil (not identified); 1st appearance of Flashback (not identified); 1st appearance of Madison Jeffries (not identified); 1st appearance of Marrina; 1st appearance of Puck; 1st appearance of Smart Alec (not identified); 1st appearance of Tundra; 1st appearance of Wild Child (not identified); 1st appearance of Wildheart (not identified) |
| 16 | Alpha Flight (1st Series) | 1st appearance of Madison Jeffries (full); Versus The Master |
| 16/NS | Alpha Flight (1st Series) | 1st appearance of Madison Jeffries (full); Versus The Master |
| 110 | Alpha Flight (1st Series) | 1st Appearance of Omega Flight; 1st Appearance of Bile; 1st Appearance of Miss Mass; 1st Appearance of Sinew; 1st Appearance of Strongarm; 1st Appearance of Tech-Noir; 1st Appearance of Ska’r; 1st Appearance of Firebug; Infinity War Crossover, Book 10 |
| 110/NS | Alpha Flight (1st Series) | 1st Appearance of Bile; 1st Appearance of Firebug; 1st Appearance of Miss Mass; 1st Appearance of Omega Flight; 1st Appearance of Sinew; 1st Appearance of Ska’r; 1st Appearance of Strongarm; 1st Appearance of Tech-Noir; Infinity War Crossover, Book 10 |
| 1 | Alpha Flight (3rd Series) | 1st Appearance of Major Mapleleaf II; 1st Appearance of Puck II; 1st Appearance of Yukon Jack; 1st Appearance of Centennial; 1st Appearance of Nemesis III |
| 1/NS | Alpha Flight (3rd Series) | 1st Appearance of Centennial; 1st Appearance of Major Mapleleaf II; 1st Appearance of Nemesis III; 1st Appearance of Puck II; 1st Appearance of Yukon Jack |
| 15-4 | Amazing Fantasy | 1st Appearance of Spider-Man (Peter Parker); 1st Appearance of Peter Parker; 1st Appearance of Aunt May Parker; 1st Appearance of May Parker; 1st Appearance of Uncle Ben Parker; 1st Appearance of Ben Parker; 1st Appearance of Flash Thompson; Death of Ben Parker; Origin of Spider-Man (Peter Parker); Marvel Legends 1st Appearance Spider-Man action figure insert |
| 15-6 | Amazing Fantasy | Reprints Amazing Fantasy #15; Reprints Amazing Spider-Man #1; 1st appearance of Ben Parker; 1st appearance of Aunt May Parker; 1st appearance of May Parker; 1st appearance of Crusher Hogan; 1st appearance of Chameleon; 1st appearance of Spider-Man; 1st appearance of Peter Parker; 1st appearance of Uncle Ben Parker; Death of Uncle Ben Parker; Origin of Spider-Man; Packaged with the Spider-Man Origins 1st appearance Spider-Man action figure; “Not for Resale” Giveaway; Contains new ads |
| 15-8 | Amazing Fantasy | Reprints Amazing Fantasy #15 (edited); 1st appearance of Ben Parker; 1st appearance of Aunt May Parker; 1st appearance of May Parker; 1st appearance of Crusher Hogan; 1st appearance of Chameleon; 1st appearance of Spider-Man; 1st appearance of Peter Parker; 1st appearance of Uncle Ben Parker; Death of Uncle Ben Parker; Origin of Spider-Man; Packaged with Marvel Authentics Die-Cast Car Series I; Mini-comic Giveaway |
| 15-9 | Amazing Fantasy | 1st appearance of Spider-Man; 1st appearance of Peter Parker; 1st appearance of Aunt May; 1st appearance of Uncle Ben; 1st appearance of Flash Thompson; 1st Appearance of Spider-Man (Peter Parker); 1st Appearance of May Parker; 1st Appearance of Ben Parker; 1st Appearance of Aunt May Parker; 1st Appearance of Uncle Ben Parker; 1st Appearance of Peter Parker; 1st Appearance of Flash Thompson; Death of Ben Parker; Death of Uncle Ben; Origin of Spider-Man (Peter Parker); Origin of Spider-Man; Old Navy reprint free with shirt purchase |
| 2 | Amazing Spider-Man, The | 1st Appearance of Mysterio (as alien); 1st appearance of Tinkerer; 1st appearance of Vulture |
| 10 | Amazing Spider-Man, The | 1st Appearance of Big Man (Frederick Foswell); 1st appearance of Enforcers; 1st appearance of Fancy Dan; 1st appearance of Montana; 1st appearance of Ox |
| 15 | Amazing Spider-Man, The | 1st Appearance of Anna May Watson; 1st appearance of Kraven the Hunter; 1st Appearance of Mary Jane Watson (name mentioned); 1st appearance of Mary Jane Watson (name mentioned); Origin of Kraven the Hunter |
| 19 | Amazing Spider-Man, The | 1st Appearance of Mac Gargan; 1st appearance of Rock Gimpy; 1st appearance of Ned Leeds; 2nd appearance of Ned Leeds; Versus The Enforcers; Versus Sandman (William Baker); Versus Enforcers |
| 25 | Amazing Spider-Man, The | 1st appearance of Mary Jane Watson; 1st appearance of Spencer Smythe; 1st appearance of Spider-Slayers |
| 42 | Amazing Spider-Man, The | 1st appearance of Mary Jane Watson |
| 73 | Amazing Spider-Man, The | 1st Appearance of Caesar Cicero; 1st appearance of Man-Mountain Marko; 1st appearance of Silvermane; 1st appearance of Silvermane (Silvio Manfredi); 1st appearance of Caesar Cicero; Peter Sanderson L.O.C. |
| 101 | Amazing Spider-Man, The | 1st Appearance of Morbius |
| 101/A | Amazing Spider-Man, The | 1st Appearance of Morbius |
| 124 | Amazing Spider-Man, The | 1st Appearance of Man-Wolf |
| 156 | Amazing Spider-Man, The | 1st Appearance of Mirage I (Desmond Charne); Origin of Mirage I (Desmond Charne); MVS Series B #83 |
| 210 | Amazing Spider-Man, The | 1st Appearance of Madame Web; Origin of Madame Web |