This is a list of first appearances of artifacts, characters, dimensions, locations, species, and teams in publications by Marvel Comics.
A
- A-Bomb in Hulk (comics) vol. 2 #2
- The Aakon in Captain Marvel #8, July 1969
- The A'Askvarii in Black Goliath #5, November 1976</li>
- Abomination in Tales to Astonish #90, April 1967
- Absorbing Man in Journey into Mystery #114,
- The Achernonians in Thor Annual #6, 1977
- The A-Chiltarians in Tales to Astonish #46, August 1963
- Adamantium in Avengers #66, July 1969
- Adam Warlock as "Him" in Fantastic Four #66, September 1967
- as "Adam Warlock" in Marvel Premiere #1, April 1972
- AIM (Advanced Idea Mechanics) in Strange Tales #146, July 1966
- Agamotto (in reference only) in Strange Tales #115, December 1963
- Agatha Harkness in Fantastic Four #94
- Aginar in Eternals #11, May 1977
- Agon in Thor #148, January 1968
- Aguila in Power Man and Iron Fist #58, August 1979
- Ahab in Fantastic Four Annual #23
- Ahqlau in Eternals (vol. 2) #2, November 1985
- Aireo in Fantastic Four #47, February 1966
- Air-Walker in Fantastic Four #120, March 1972
- Ajak in Eternals #2, August 1976
- Alfheim in Thor #277, November 1978
- Alicia Masters in The Fantastic Four #8
- Allatou in Marvel Spotlight #18, October 1974
- The Alpha Centaurians in Sub-Mariner #17, September 1969
- Alpha Flight in Uncanny X-Men #121, April 1979
- Alpha Primitives in Fantastic Four #47, February 1966
- Amadeus Cho in Amazing Fantasy vol.2 #15
- American Eagle in Marvel Two-in-One Annual #6, October 1981
- Amphibian in Avengers #145, March 1976
- Amphibius in X-Men #62
- Anaconda in Marvel Two-in-One #64, June 1980
- Ancient One in Strange Tales #110, July 1963
- Andrea Benton (Andi) who becomes the symbiote Mania in Venom vol. 2 #31 (cameo), #32 (full appearance)
- Andromeda in Defenders #143, May 1985
- Angar the Screamer in Daredevil #100, June 1973
- Angel in X-Men #1, September 1963
- The Ani-Men in Daredevil #10, October 1965
- Annalee in Power Pack #12, July 1985
- Annihilus in Fantastic Four Annual #6, November 1968
- Ant-Man (Scott Lang) in Marvel Premiere #47, April 1979
- Ape in Power Pack #12, July 1985
- Ape-Man in Daredevil #10, October 1965
- Ape-X in Squadron Supreme #5, January 1986
- Apocalypse in X-Factor #6, June 1986
- Aquarian (Wundarr) in Adventure into Fear #17, October 1973
- Wundarr as Aquarian: Marvel Two-in-One #58
- Aquarius in Avengers #72, January 1970
- Arabian Knight in Incredible Hulk #257, March 1981
- Aragorn in Avengers #48, January 1968
- Arcade in Marvel Team-Up #65, January 1978
- Arcanna in Defenders #112, October 1982
- Archangel in X-Factor #24
- Arclight in Uncanny X-Men #210, October 1986
- The Arcturans in Adventure into Fear #23, August 1974
- Ares (modern) in Thor #129, June 1966
- Aries in Avengers #72, January 1970
- Arishem the Judge in Eternals #2, August 1976
- Arkon in Avengers #75, April 1970
- Armageddon in Exiles #41
- Aron in 'Captain Marvel #39
- Arkus in Sub-Mariner #63, July 1973
- Arlok in What If #27, July 1981
- Armadillo in Captain America #308, August 1985
- Arnim Zola in Captain America #208, April 1977
- Asgard in Journey into Mystery #85, October 1962
- Asmodeus I in Fantastic Four #117, December 1971
- Asmodeus in Ghost Rider (vol. 2) #53, February 1981
- Asp in Captain America #309, September 1985
- Asteroid M in X-Men #5, June 1964
- Astra in Uncanny X-Men #107, October 1977
- Astra II in Rom #25, December 1981
- The Astrans in Incredible Hulk #6, March 1963
- Astron in What If #27, July 1981
- Atlantis in Fantastic Four Annual #1, 1963
- Atra in Marvel Team-Up Annual #5, 1982
- Attilan in Fantastic Four #47, February 1966
- Attuma in "Fantastic Four" #33, December 1964
- Aurora in Uncanny X-Men #120, April 1979
- The Autocrons in Machine Man #3, June 1978
- Avalanche in Uncanny X-Men #141, January 1981
- The Avengers in Avengers #1, September 1963
- Avius in Fantastic Four #129, December 1972
- Awesome Android in Fantastic Four #15, June 1963
- The Axi-Tun in Invaders #1, August 1975
- Azazel in Uncanny X-Men # 428
B
- Badoon in Silver Surfer #2
- Balder in Journey into Mystery #85
- Banshee in X-Men #28
- Baron Mordo in Strange Tales #111
- Baron Von Strucker in Sgt. Fury and his Howling Commandos #5
- Baron Zemo,Original in Avengers #4
- Baron Zemo in Captain America #168
- Basilisk in Marvel Team-Up #16
- Bastion in X-Men #52 (cameo); Uncanny X-Men #333 (full)
- Batroc the Leaper in Tales of Suspense #75
- Baxter Building in Fantastic Four #3 (First named in #6)
- Beast in X-Men #1
- Beast (in furry form) in Amazing Adventures #11
- Dark Beast in X-Men: Alpha
- Ben Apps in Blue Oyster Adventures #1
- Ben Urich in Daredevil #153
- Beta Ray Bill in Thor #337
- Bethany Cabe in Iron Man #117
- Betty Brant in The Amazing Spider-Man #4
- Betty Ross in The Incredible Hulk #1
- Betty Ross (Golden Girl) in Captain America Comics #1
- Beyonder in Secret Wars #1
- Bi-Beast in Incredible Hulk #169
- Bishop in Uncanny X-Men #282
- Black Bolt in Fantastic Four #45
- Black Cat in The Amazing Spider-Man #194, July 1979
- Black Tom Cassidy in Uncanny X-Men #99 (in shadows), Uncanny X-Men #101 (full)
- Blackheart in Daredevil #270
- Black Knight
- I: as Sir Percy of Scandia in Black Knight Comics #1
- II: as Nathan Garrett in Tales to Astonish #52
- III: as Dane Whitman in The Avengers #47
- IV: (Vatican Black Knight) in The Black Panther #3
- Black Mamba in Marvel Two-in-One #64
- Blackout in Ghost Rider Vol.2 #2
- Black Panther in Fantastic Four #52
- Black Talon (original) in Strange Tales #173
- Black Widow
- I: as Claire Voyant in Mystic Comics #4
- II: as Natalia Romanova in Tales of Suspense #52
- III: as Yelena Belova in Inhumans (vol. 2) #5
- Blade in Tomb of Dracula #10
- BlackAxe in BlackAxe #1
- Blastaar in Fantastic Four #62
- Blink in X-Men: Alpha
- I: as Clarice Ferguson in Uncanny X-Men #317
- Blizzard
- I: as Jack Frost in Tales of Suspense #45
- II: in Iron Man #223
- Blob in X-Men #3
- BloodAxe in Thor #448
- Blood Brothers in Iron Man #55
- Bloodseed in Bloodseed #1
- Ulysses Bloodstone in Marvel Presents #1
- Elsa Bloodstone in Bloodstone #1
- Boomerang in Tales to Astonish #81
- Brian Banner in Incredible Hulk #267
- Brood in Uncanny X-Men #155
- Broo in Wolverine & the X-Men #1
- Brother Voodoo in Strange Tales #169
- Brotherhood of Evil Mutants in Uncanny X-Men #4
- Bucky Barnes in Captain America Comics #1
- Bullet in Daredevil #250
- Bullseye in Daredevil #131
- Bushwacker in Daredevil #248
C
- Cable in New Mutants #87
- Caiera in Incredible Hulk vol.3 #92
- Callisto in Uncanny X-Men #169
- Calypso in The Amazing Spider-Man #209
- Cannonball in Marvel Graphic Novel #4
- Captain America in Captain America Comics #1
- Captain Britain (Brian Braddock)
- England: Captain Britain Weekly #1 (October 13, 1976)
- United States: Marvel Team-Up #65
- as Kelsey Leigh Kirkland in Avengers #77
- Captain Marvel
- as Mar-Vell in Marvel Super-Heroes #12
- as Monica Rambeau (also known as Photon or Pulsar) in The Amazing Spider-Man Annual #16 (1982)
- Captain Universe in Micronauts #8
- Carnage in The Amazing Spider-Man #361
- Cardiac in The Amazing Spider-Man #344
- Cardinal in New Warriors #28
- The Cat (Greer Grant) in Claws of the Cat #1
- Cecilia Reyes in X-Men vol. 2 #65
- The Celestials in Eternals #1
- Cerebro in X-Men #7
- Cerise in Excalibur #47
- Charlie-27 in Marvel Super-Heroes #18
- Chamber in Generation X #1
- Chameleon in The Amazing Spider-Man #1
- Champion of the Universe in Marvel Two-in-One Annual #7
- The Circus Of Crime in Incredible Hulk #3
- Clea in Strange Tales #126 (name is only revealed in #146)
- Cletus Kasady in The Amazing Spider-Man #345
- Cloak in The Spectacular Spider-Man #64
- Cobalt Man in X-Men #31
- Cobra in Journey into Mystery #98
- Cobweb in Sleepwalker #3
- Colonel Armbuster in The Incredible Hulk #164
- Collector in Avengers #28
- Colleen Wing in Marvel Premiere #19
- Colossus in Giant-Size X-Men #1
- Constrictor in Incredible Hulk #212
- Contessa Valentina Allegra de la Fontaine in Strange Tales #159
- Count Nefaria in Avengers #13
- Crimson Dynamo:
- Anton Vanko: Tales of Suspense #46
- Dmitri Bukharin: Iron Man #109
- Crossbones in Captain America #359 (in costume #360)
- Crossfire in Marvel Two-in-One #52
- Crusader in Thor #330
- Crystal in Fantastic Four #45
- Cyber in Marvel Comics Presents #85
- Cyclops in X-Men #1
D
- Dagger in The Spectacular Spider-Man #64
- Daken in Wolverine Origins # 10
- Dakota North in Dakota North #1
- Damage Control in Marvel Comics Presents #19
- Daredevil in Daredevil #1
- Dark Angel in Hell's Angel #1
- Darkhawk in Darkhawk #1
- Darkhold Redeemers in Darkhold #1
- Dazzler in Uncanny X-Men #130, February 1980
- Deadpool in New Mutants #98
- Deadzone in Moon Knight #47
- Deathbird in Ms. Marvel #9
- Deathwatch in Ghost Rider Vol.2 #1
- Death's Head in Dragon's Claws #5
- Death Metal in Death3 #1
- Deathlok in Astonishing Tales #25
- Debra Whitman in The Amazing Spider-Man #196
- Defenders in Marvel Feature #1
- Demogoblin in Web of Spider-Man #86
- Destiny
- as Paul Destine (behind the scenes) in Tales to Astonish #101; (actual) in Iron Man and Sub-Mariner #1, April 1968
- as a Marvel Comics personification in Marvel Two-in-One #6, November 1974
- as Irene Adler in Uncanny X-Men #141, January 1981
- Destroyer
- Golden Age hero: Mystic Comics #6, October 1941
- Marvel Comics villain: Strange Tales #101, October 1962
- Thor character: Journey into Mystery #118, July 1965
- Deviants in The Eternals #1
- Diablo in Fantastic Four #30
- Diamondback in Captain America #310
- Die-Cut in Deaths Head & Die Cut #1
- Dire Wraith in ROM #1
- Doc Samson in Incredible Hulk #141
- Doctor Doom in Fantastic Four #5
- Doctor Druid in Amazing Adventures #1
- Doctor Faustus in Captain America #107
- Doctor Octopus in The Amazing Spider-Man #3
- Doctor Strange in Strange Tales #110
- Domino in New Mutants #98
- Dormammu in Strange Tales #126
- Dracula in Tomb of Dracula #1
- Dragon Man in Fantastic Four #35
- Drax the Destroyer in Iron Man #55
- Dreadnought in Strange Tales #154
- D'Spayre in Marvel Team-Up #68
E
- Earth Force in Thor #395
- Echo in Daredevil (vol. 2) #9
- Eddie Brock (Venom) in The Amazing Spider-Man #298
- Edwin Jarvis in Tales of Suspense #59
- Eel
- I: in Strange Tales #112
- II: in Power Man and Iron Fist #92
- Egghead in Tales to Astonish #38
- Ego in Thor #132
- Electro in The Amazing Spider-Man #9
- Elektra in Daredevil #168
- Enchantress in Journey into Mystery #103
- Epoch in Quasar #27
- The Eternals in The Eternals #1
- Eternity in Strange Tales #138
- Executioner in Journey into Mystery #103
- Ezekiel Stane in The Order #8
F
- Falcon in Captain America #117
- Famine in X-Factor #12
- Fantomex in New X-Men #128
- Fandral in Journey into Mystery #119
- Fantasti-Car in Fantastic Four #3
- Fantastic Four in Fantastic Four #1
- Feral in New Mutants #99
- Fin Fang Foom in Strange Tales #89
- Firebird in Incredible Hulk #265
- Firelord in Thor #225
- Firestar (TV first appearance)
- Spider-Man and His Amazing Friends, episode 1: "The Triumph of the Green Goblin" (original airdate: December 1981)
- in comics: Spider-Man and His Amazing Friends #1, December 1981
- Flash Thompson in Amazing Fantasy #15
- Foggy Nelson in Daredevil #1
- Foolkiller in Foolkiller #1
- Forge in Uncanny X-Men #184
- Forgotten One in The Eternals #13
- Franklin Richards in Fantastic Four Annual #6
- Frightful Four in Fantastic Four #36
G
- Gaea in Doctor Strange #6
- Galactus in Fantastic Four #48
- Gambit in Uncanny X-Men #266
- Gamora in Strange Tales #180
- Gardener in Marvel Team-Up #55
- Gargantus in Tales of Suspense #40
- Gargoyle in The Incredible Hulk #1
- Gazer in X-Men (vol. 2) #169
- Garokk in Astonishing Tales #2
- Geirrodur in Journey into Mystery #101
- General Ryker in The Incredible Hulk vol.3 #12
- General "Thunderbolt" Ross in Incredible Hulk #1
- Ghaur in Eternals (vol. 2) #2
- Ghost Rider
- as John "Johnny" Blaze in Marvel Spotlight #5
- as Danny Ketch in Ghost Rider (vol. 2) #1
- Gideon in New Mutants #98
- Gladiator (Melvin Potter) in Daredevil #18
- Glob in Incredible Hulk #121
- Glorian in Incredible Hulk #191
- Goddess in Infinity War #6
- Gorgon in Fantastic Four #44
- Grand Director
- as 50s Captain America: Captain America' #153
- as Grand Director: Captain America #232
- Grandmaster in The Avengers #69
- Gravity in Gravity #1
- Green Goblin
- as Norman Osborn II in The Amazing Spider-Man #14
- as Harold (Harry) Osborn in The Amazing Spider-Man #136
- Graydon Creed in Uncanny X-Men #299
- Gremlin in Incredible Hulk #163
- Grey Gargoyle in Journey into Mystery #107
- Grim Reaper in Avengers #52
- Groot in Tales to Astonish vol. 1 #13 (1960)
- Gwen Stacy in The Amazing Spider-Man #31
H
- Hades (see Pluto)
- Hammerhead (comics) in The Amazing Spider-Man #113
- Happy Hogan in Tales of Suspense #45
- Hardcore in Cage #1
- Hate Monger in Avengers #341
- Havok:
- as Alex Summers in Uncanny X-Men #54
- as Havok in Uncanny X-Men #57
- Hawkeye in Tales of Suspense #57
- Heart Attack in Ghost Rider #8
- Heimdall in Journey into Mystery #85
- Hel in Thor #176
- Hela in Journey into Mystery #102
- Heliopolis in Thor #240
- Hellfire Club in X-Men #129
- Hellstorm (as Daimon Hellstrom) in Ghost Rider (vol. 2) #2
- HellCat (Patsy Walker) in Avengers #144
- Henry Pym in Tales to Astonish #27, January 1962
- as Ant-Man in Tales to Astonish #35, September 1962
- as Giant-Man in Tales to Astonish #49, November 1963
- Her in Marvel Two-in-One #61
- Hercules in Journey into Mystery Annual #1
- High Evolutionary in Thor #134
- Hobgoblin in The Amazing Spider-Man #238
- Hoggoth (see Vishanti) in Strange Tales #116
- Hogun in Journey into Mystery #119
- Holocaust in X-Men: Alpha
- Horsemen of Apocalypse in X-Factor #15
- Howard Stark in Iron Man #28
- Howard the Duck in Adventure into Fear #19
- Hulk in Incredible Hulk #1
- Human Cannonball in Incredible Hulk #3
- Human Torch
- I: Jim Hammond in Marvel Comics #1, October 1939
- Silver Age reappearance in Fantastic Four Annual #4, 1966
- II: Johnny Storm in Fantastic Four #1, November 1961
- I: Jim Hammond in Marvel Comics #1, October 1939
- HYDRA in Strange Tales #135
- Hydro-Man in The Amazing Spider-Man #212
- Hyperion in The Avengers #69
- as Zhib-Ran (in Squadron Sinister) in The Avengers #69, October 1969
- as Mark Milton (in Squadron Supreme) in The Avengers #85, February 1971
I
- Iceman in X-Men #1
- Idie in Uncanny X-men #528
- Ikaris in Eternals #1
- Impossible Man in "Fantastic Four" #11
- Impossible Woman in Marvel Two-in-One #60
- Impulse in New Warriors #4
- In-Betweener in Warlock #10
- Inhumans in Fantastic Four #45
- Interloper in Defenders #147
- Invisible Woman in Fantastic Four #1
- Iron Fist in Marvel Premiere #15
- Iron Man in Tales of Suspense #39
- Iron Man 2020 in Machine Man Vol.2 #2
- Iron Monger
- as Obadiah Stane: Iron Man #163
- as Iron Monger: Iron Man #200
- Isaiah Bradley in Truth: Red, White & Black #1
- Isis in Thor #240
- It the Living Colossus in Tales of Suspense #14
J
- J. Jonah Jameson in The Amazing Spider-Man #1
- Jarella in The Incredible Hulk vol.2 #140
- Jeffrey Mace (Patriot) in Human Torch Comics #4
- Jessica Jones in Alias #1
- Jester in Daredevil #42
- Jigsaw in The Amazing Spider-Man #161
- Jim Wilson in Incredible Hulk vol.2 #131
- Jocasta in Avengers #162
- Joe "Robbie" Robertson in The Amazing Spider-Man #57
- Joseph in Uncanny X-Men #327
- Jotunheim in Journey into Mystery #114
- Jubilee in Uncanny X-Men #244
- Judas Traveller in Web of Spider-Man #117
- Juggernaut in X-Men #12
K
- Kang the Conqueror in Avengers #8
- as Rama-Tut: Fantastic Four #19
- Kaine in Web of Spider-Man #119
- Karen Page in Daredevil #1
- Karma in Marvel Team-Up #100
- Karnak in Fantastic Four #45
- Karnilla in Journey into Mystery #107
- Kate Cushing in The Amazing Spider-Man #270
- Ka-Zar in X-Men #10
- Kid Gladiator in Wolverine & the X-Men #1
- Killer Shrike in Rampaging Hulk #1
- Kingpin in The Amazing Spider-Man #50
- Kirigi in Daredevil #174
- Kitty Pryde in Uncanny X-Men #129
- Klaw in Fantastic Four #53
- Korvac in Giant-Size Defenders #1
- Kraven the Hunter in The Amazing Spider-Man #15
- The Kree in Fantastic Four #65
- Kro in Eternals #1
- Kurse in Thor #347
- Kylun in Excalibur #47
L
- Lady Bullseye in Daredevil vol.2 #111
- Lady Deathstrike in Alpha Flight #33
- The Lava Men in Journey into Mystery #97
- Leader in Tales to Astonish #62
- Leap-Frog in Daredevil #25
- Leech in Uncanny X-Men #179
- Lilith in Ghost RiderVol. 2 #28
- Living Tribunal in Strange Tales #157
- Living Laser in Avengers #34
- Living Lightning in West Coast Avengers #63
- Liz Allan in Amazing Fantasy' #15; named The Amazing Spider-Man #4
- Lizard in The Amazing Spider-Man #6
- Lockheed in X-Men #166
- Lockjaw in Fantastic Four #45
- Loki in Journey into Mystery #85
- Longshot in Longshot #1
- Lord Chaos in Marvel Two-in-One #2
- Lorelei in Thor #337
- Lucifer in X-Men #9
- Luke Cage in Luke Cage, Hero for Hire #1
- Luna in Fantastic Four #240
- Lyja in Fantastic Four #357
M
- M in Uncanny X-Men #316
- Maa-Gor in X-Men #10
- MACH IV (as Beetle) in Strange Tales #123
- Machine Man in 2001: A Space Odyssey #8
- Mad-Dog (as Robert "Buzz" Baxter) in Amazing Adventures #13
- Madame Masque
- as Big M in Tales of Suspense #97
- as Whitney Frost in Tales of Suspense #98
- Madame Web in The Amazing Spiderman #210
- Madman
- as Philip Stern in Incredible Hulk #363
- as Madman in Incredible Hulk #364
- Mad Thinker in Fantastic Four #15
- Maelstrom in Marvel Two-In-One # 71
- Maggia in Avengers #13
- Maggott in Uncanny X-Men #345
- Magik in Giant-Size X-Men #1
- Magma in New Mutants #8
- Magneto in X-Men #1
- Magus in Strange Tales #178
- Major Victory in Marvel Super-Heroes #18
- Makkari in Eternals #5
- Malekith in Thor #344
- Malevolence "Mephisto's Daughter" in Guardians of the Galaxy #7
- Mania the symbiote in Venom (comics) vol. 2 # 38, featured on the cover of #40
- Man-Beast in Thor #135
- Man-Bull in Daredevil #78
- Man-Thing in Strange Tales #1
- Man-Wolf (John Jameson) in The Amazing Spider-Man #124
- Mandarin in Tales of Suspense #50
- Mandrill in Shanna the She-Devil #4
- Mantis in Avengers #112
- Maria Hill in New Avengers #4
- Marlene Alraune in Incredible Hulk #11
- Marvel Boy (Noh-Varr) in Marvel Boy #1
- Marvel Girl (Jean Grey) in X-Men #1
- Marvel Man (Quasar) in Captain America #217
- Mary Jane Watson in The Amazing Spider-Man #25
- Masked Marauder in Daredevil #16
- Mastermind in X-Men #4
- Master Mold in X-Men #15
- Master Order in Marvel Two-in-One #2
- Masters of Evil in The Avengers #6
- Matador in Daredevil #5
- May Parker in Amazing Fantasy #15
- Maximus in Fantastic Four #47
- Medusa in Fantastic Four #36
- Meltdown in Secret Wars II #5
- Meggan in New Mutants Annual #2
- Melter in Tales of Suspense #47
- Mentallo in Strange Tales #141
- Mentor
- I: A'lars in Iron Man #55
- II: android in X-Men #107
- Merlin
- I: Black Knight Comics #1; (modern) Strange Tales #134
- II: Journey into Mystery #96
- III: Captain Britain #1; (American) Marvel Team-Up #65
- Mephisto (comics) in Silver Surfer #3
- Micromax in Excalibur #44
- Mikhail Rasputin in Uncanny X-Men #285 (first mentioned Uncanny X-Men #99)
- Milla Donovan in Daredevil vol.2 #41
- The Mindless Ones in Strange Tales #127
- Mimic in X-Men #19
- Minotaur in The Avengers #17
- Mirage in Marvel Graphic Novel #4
- Missing Link in Incredible Hulk #105
- Mister Fear in Daredevil #6
- Mister Hyde in Journey into Mystery #99
- Mister Sinister in Uncanny X-Men #221
- Misty Knight in Marvel Team-Up #1 (named in Marvel Premiere #20)
- Mockingbird (Barbara "Bobbi" Morse-Barton) in Astonishing Tales #6, June 1971
- Huntress in Marvel Super Action #1, January 1976
- Mockingbird in Marvel Team-Up #95, July 1980
- MODOK in Tales of Suspense #94
- Moira MacTaggert in Uncanny X-Men #96
- Mojo in Longshot #3
- Mole Man in Fantastic Four #1
- Molecule Man in Fantastic Four #20
- Molten Man in The Amazing Spider-Man #28
- Moon Knight in Werewolf by Night #32
- Moondragon in Iron Man #54
- Moonstone
- I: in Captain America #192
- II: as Moonstone in Incredible Hulk #228
- II: as Meteorite in Incredible Hulk #449
- Morbius, the Living Vampire in The Amazing Spider-Man #101
- Morg in Silver Surfer # 70
- Morgan Stark in Tales of Suspense #68
- Morlun in The Amazing Spider-Man vol.2 #30
- Moses Magnum in Giant Size Spider-Man # 4
- Ms. Marvel in Marvel Super-Heroes #13
- Motormouth in Motormouth #1
- Multiple Man in Giant Size Fantastic Four #4
- Mutant 2099 in Mutant 2099 (one-shot)
- Mysterio in The Amazing Spider-Man #13
- Mystique
- I: as Raven Darkholme in Ms. Marvel #16
- II: as Mystique in Ms. Marvel #18
N
- Namor the Sub-Mariner
- (original creation, for unpublished comic) Motion Picture Funnies Weekly, 1939
- (Golden Age) Marvel Comics #1, October 1939
- (modern) in Fantastic Four #4
- Namorita in Sub-Mariner #50
- Nebula in Avengers #257
- Necrom in Excalibur #45
- Ned Leeds in The Amazing Spider-Man #18
- Negative Zone in Fantastic Four #51
- New Warriors in Thor #411, December 1989
- Nick Fury in Sgt. Fury and His Howling Commandos #1
- Night Thrasher in Thor #411
- Nightcrawler in Giant-Size X-Men #1
- Nightmare in Strange Tales #110
- Nitro in Captain Marvel #34
- Nomad (Jack Monroe) in Captain America #282
- as 50s Bucky: Captain America #153
- Nova (Richard Rider) in Nova #1 vol 1
- Nova (Sam Alexander) in Marvel Point One one-shot (2011)
- Nova (Frankie Raye) in Fantastic Four #164
O
- Occulus in Fantastic Four #363
- Odin in Journey into Mystery #86
- Olympus in Journey into Mystery Annual #1
- Omega Red in X-Men (vol. 2) #4
- Onslaught in X-Man #15
- Orb in Marvel Team Up #15
- Orka in Sub-Mariner #23
- Oshtur (reference only) in Strange Tales #120
- Overmind in Fantastic Four #113
- Ovoids in Fantastic Four #10
- Owl in Daredevil #3
P
- Pantheon in Incredible Hulk #368
- Patsy Walker in Miss America Magazine #2, November 1944 (see Hellcat)
- Penance in Generation X #1
- Pepper Potts in Tales of Suspense #45
- Phaeder in Marvel Two-in-One #71
- Phantom Rider
- I: Carter Slade in Ghost Rider #1
- II: Jamie Jacobs in Western Gunfighters #7
- III: Marshall Lincoln Slade in Western Gunfighters #7
- IV: Reno Jones in Gunhawks #1
- V: Hamilton Slade in Ghost Rider #56 (May 1981)
- Phoenix
- as Jean Grey in X-Men #101
- as Rachel Summers in Uncanny X-Men #141
- Pip the Troll in Strange Tales #179
- Plague in Uncanny X-Men #169
- Plantman in Strange Tales #113
- Pluto in Thor #127
- Polaris in X-Men #49
- Porcupine in Tales to Astonish #48
- Proctor in Avengers #344
- Professor Power in Marvel Team-Up #117
- Professor Warren in The Amazing Spider-Man #31
- As Jackal: The Amazing Spider-Man #129
- Professor X in X-Men #1
- Prowler in The Amazing Spider-Man #78
- Psycho Man in Fantastic Four King-Sized Special #6
- Psylocke in Captain Britain #8
- Puck in Alpha Flight #1
- Puma in The Amazing Spider-Man #256
- Punisher in The Amazing Spider-Man #129
- Puppet Master in Fantastic Four #8
- Purple Man in Daredevil vol.1 #4
- Pyro in Uncanny X-Men #141
Q
- Qnax in Tales to Astonish #73
- Quasar in Incredible Hulk #234
- Quasimodo in Fantastic Four Annual #4
- Quicksilver in X-Men #4
R
- Radioactive Man in Journey into Mystery #93
- Rage in Avengers #326
- Ransak the Reject in Eternals #8
- Random in X-Factor #88
- Red Ghost in Fantastic Four #13
- Red Guardian in Avengers #44
- Red Skull in Captain America #7
- Reed Richards (Mister Fantastic) in The Fantastic Four #1
- Rhino in The Amazing Spider-Man #41
- Richard Parker in The Amazing Spider-Man Annual #5
- Rick Jones in The Incredible Hulk #1
- The Rigellians in Thor #129
- Rikki Barnes in Captain America vol.2 #1
- Ringmaster in Hulk #3
- Rocket Raccoon in Marvel Preview # 7
- Rogue in Avengers Annual #10
- Rom in ROM #1
- Ronin in New Avengers #11 (identity revealed as Echo in #13)
- Rose in The Amazing Spider-Man #83
S
- Sabretooth in Iron Fist #14
- Salem's Seven in Fantastic Four #186
- Sandman in Amazing Spider-Man #4
- Sarcen in Punisher War Journal #25
- Sasquatch in Uncanny X-Men #120
- Satana in Vampire Tales #2
- Sauron in X-Men #60
- Scarecrow
- as Ebenezer Laughton in Tales of Suspense #51, March 1964
- as Straw Man in Dead of Night #11, August 1975
- Scarlet Witch in X-Men #4
- Scarlet Spider (Benjamin Ben Reilly) in The Amazing Spider-Man #149
- Scrier in The Spectacular Spider-Man #217
- Scorpion in The Amazing Spider-Man #20
- Sebastian Shaw in Uncanny X-Men #129
- The Sentinels in X-Men #14
- Sentry in The Sentry #1
- Serpent Crown (as Helmet of Power) in Tales to Astonish #101
- Serpent Squad in Captain America #163
- Sersi in Eternals #3
- Seth in Thor #240
- Shadow King:
- as Amahl Farouk: Uncanny X-Men #116
- as Shadow King: Uncanny X-Men #265
- Sharon Carter in Tales of Suspense #75
- Shatterstar in New Mutants #99
- She-Hulk in Savage She-Hulk #1
- She-Thing
- as Sharon Ventura in The Thing #27
- as Ms Marvel in The Thing #35
- as She-Thing in Fantastic Four #310
- Shiva in Wolverine vol. 2 #50
- Shock in Daredevil #314
- Shocker in The Amazing Spider-Man #46
- Shuma-Gorath in Marvel Premiere #5
- Siege in Deathlok #19
- Sif in Journey into Mystery #102
- Silk (Marvel comics) in The Amazing Spider-man (vol. 5) #4
- Silverclaw in Avengers vol.3 #8
- Silver Sable in The Amazing Spider-Man #265
- Silver Samurai in Daredevil #111
- Silver Surfer in Fantastic Four #48
- Silverman in The Amazing Spider-Man #73
- Sin in Captain America #290
- Siryn in Spider-Woman #37
- Sisters of Sin in Captain America #294
- Skaar in World War Hulk # 5
- The Skrulls in Fantastic Four #2
- Slapstick in Slapstick #1
- Slayback in Deadpool #4
- Sleepwalker in Sleepwalker #1
- Slug in Captain America #325
- Songbird
- as Screaming Mimi in Marvel Two-in-One #54
- as Songbird in Incredible Hulk #449
- Sons of the Serpent in Avengers #32
- Space Phantom in The Avengers vol.1 #2
- Speedball in The Amazing Spider-Man Annual #22
- Sphinx in New Warriors #4
- Spider-Girl in What If...? #105
- Spider-Man in Amazing Fantasy #15
- Spider-Woman
- I: Jessica Drew in Marvel Spotlight #32
- II: Julia Carpenter in Marvel Super Heroes Secret Wars #6
- III: Mattie Franklin in Spectacular Spider-Man #263
- Spiral in Longshot #1
- Splice in Wonder Man # 4
- Spymaster
- I: in Iron Man #33
- II: in Iron Man #254
- Squadron Sinister in Avengers #69
- Squadron Supreme in Avengers #85-86
- Star-Lord in Marvel Previews #4
- Starfox (Eros) in Iron Man #55
- Starhawk in Defenders #27
- Stark Industries in Tales of Suspense #40
- Starr Saxon in Daredevil #49
- Stick in Daredevil #176
- Stilt-Man in Daredevil #8
- Stingray
- as Walter Newell in Tales to Astonish #95, September 1967
- as Stingray in Sub-Mariner #19, November 1969
- Storm in Giant-Size X-Men #1
- Stranger in X-Men #11
- Strong Guy in New Mutants Annual #1
- Stryfe in New Mutants #87
- Sunfire in X-Men #64
- Super-Adaptoid in Tales of Suspense #82
- Superior Spiderman in Daredevil vol. 3 #21
- Superior Venom in Superior Spiderman #24
- Surtur in Journey into Mystery #97
- Swordsman in Avengers #19
T
- Major/Colonel Glenn Talbot in Tales to Astonish #61
- Talon in Guardians of the Galaxy # 18
- Tarantula in The Amazing Spider-Man #134
- Taskmaster in Avengers #195
- Techno (as Fixer) in Strange Tales #141
- Terrax in Fantastic Four #211
- Terror Inc. in Terror Inc. #1
- Thanos in Iron Man #55
- Thena in Eternals #5
- The Thing in The Fantastic Four #1
- Thor in Journey into Mystery #83
- Thor Girl in Thor (vol. 2) #22 (as "Thor Girl" in #33)
- Thunderbird in Giant-Size X-Men #1
- Thunderbolts in Incredible Hulk #449
- Thunderstrike (Eric Masterson) in Thor #391
- Thundra in Fantastic Four #129
- Tiger Shark in Sub-Mariner #5
- Tigra in Tigra: Giant-Size Creatures #1 (see the Cat)
- Titania
- I: Davida DeVito in Marvel Two-in-One #54
- II: Mary MacPherran in Marvel Super Heroes Secret Wars #3
- Titanium Man in Tales of Suspense #69
- Toad in X-Men #4
- Tombstone in Web of Spider-Man #36
- Transformers in The Transformers #1
- Trapster:
- as Paste-Pot Pete: Strange Tales #104
- as Trapster: Fantastic Four #38
- Trevor Fitzroy in X-Men #281
- Triton in Fantastic Four #45
- Turbo in New Warriors #28
- Typhoid Mary in Daredevil #254
- Tyr in Journey into Mystery #85
- Tyrannus in Incredible Hulk #5
U
- U-Foes in Incredible Hulk #254
- Uatu the Watcher in The Fantastic Four #13
- Ulik in Thor #137
- Ultron in Avengers #54
- Umar in Strange Tales #150
- Uncle Ben in Amazing Fantasy #15
- Unus the Untouchable in X-Men #8
- Uni-Mind in Eternals #12
- Unicorn in Tales of Suspense #56
- Union Jack
- I: in Invaders #7
- II: in Invaders #20
- III: in Captain America #254
- Ursa Major in Incredible Hulk #258
- U.S. Agent in Captain America #323
V
- Valeria Von Doom in Fantastic Four vol.3 #15
- Valkyrie in Avengers #83
- Vanisher in X-Men #2
- Vengeance in Ghost Rider Volume 2 #21
- Venom in The Amazing Spider-Man #299
- Vermin in Captain America #272
- Vindicator in Uncanny X-Men #120
- Viper (Jordan Dixon) in Captain America #157
- Viper (Madame Hydra):
- as Madame Hydra: Captain America vol.1 #110
- as Viper: Captain America #180
- The Vishanti in Strange Tales #115
- Vision in Avengers #57
- Volstagg in Journey into Mystery #119
- Vulture in The Amazing Spider-Man #2
- Volcana in The Secret Wars #3
W
- Wakanda in Fantastic Four #52
- War
- as Abraham Kieros in X-Factor #11
- War Machine (James Rupert Rhodes)
- as James "Rhodey" Rhodes in Iron Man #118, January 1979
- as Iron Man in Iron Man #170, May 1983
- as War Machine in Iron Man #282, September 1992
- Warlord Krang in Fantastic Four Annual #1, 1963
- Warpath
- as Thunderbird II: New Mutants #16
- as Warpath: New Mutants #99
- Wasp in Tales to Astonish #44
- The Watchers in Fantastic Four #13
- Weapon Omega in Alpha Flight #11
- Wendigo in Incredible Hulk #162
- Werewolf by Night in Marvel Spotlight #2
- Whiplash
- Mark Scarlotti: Tales of Suspense #97 (as Whiplash), Iron Man #146 (as Blacklash)
- Anton Vanko: Iron Man vs Whiplash #1
- White Tiger
- I: Hector Ayala in Deadly Hands of Kung Fu #19
- II: White Tiger (Heroes for Hire) in Heroes for Hire #1
- III: Kasper Cole in Black Panther vol.3 #50
- IV: Angela Del Toro in Daredevil vol.2 #50
- V: Ava Ayala in Avengers Academy #20
- Whirlwind (as Human Top) in Tales to Astonish #50
- Whizzer
- I: Robert Frank in USA Comics #1, August 1941
- II: Jame Sanders in The Avengers #69, October 1969
- III: Stanley Stewart in The Avengers #85, March 1971
- White Queen (Emma Frost) in Uncanny X-Men #129
- Wild Thing in Wild Thing #1
- William Naslund (Spirit of '76) in The Invaders #14
- Willie Lumpkin in Fantastic Four #11
- Wizard in Strange Tales #102
- Wolfsbane in New Mutants Graphic Novel
- Wolverine in Incredible Hulk #180 (cameo), #181 (on cover & full appearance)
- Wonder Man in Avengers #9
- Wong in Strange Tales #110 (named in Strange Tales #127)
- Wraith
- I: in Marvel Team-Up #48
- II: in Wolverine vol. 2 #48
- Wrecker in Thor #148
- Wundagore
- I: in Thor #134
- II: in Tales to Astonish #94
- Wyatt Wingfoot in Fantastic Four #50
X
- X-51, Machine Man in 2001: A Space Odyssey #8, July 1977
- X-23 in Nyx #3, February 2004
- X-Man (Nate Grey) in X-Men: Alpha
- The X-Men in X-Men #1
- Xemnu the Titan in Journey into Mystery #62
Y
- The Yancy Street Gang in Fantastic Four #11
- Yellow Claw
- in Marvel predecessor Atlas Comics: Yellow Claw #1
- as telepathic "voice" in Strange Tales #160
- as robot in Strange Tales #161
- Yellowjacket
- as Henry Pym in Avengers #59, December 1968
- as Rita DeMara (villain) in Avengers #264
- Yukio in Wolverine #2
Z
- Zabu in X-Men #10
- Zarrko, the Tomorrow Man, in Journey into Mystery #86
- Zeus in Journey into Mystery Annual #1
- Zodiak in Ghost Rider vol.2 #10
- Zombie in Menace #5
- Zuras in Eternals #5
- Zzzax in Incredible Hulk #166
Ultimate imprint
- Spider-Man in Ultimate Spider-Man #1
- Hulk in Ultimate Marvel Team-Up #2
- Cyclops in Ultimate X-Men #1
- Professor X in Ultimate X-Men #1
- Jean Grey in Ultimate X-Men #1
- Beast in Ultimate X-Men #1
- Iceman in Ultimate X-Men #1
- Storm in Ultimate X-Men #1
- Colossus in Ultimate X-Men #1
- Iron Man in Ultimate Marvel-Team-Up #4
- Punisher in Ultimate Marvel-Team-Up #6
- Daredevil in Ultimate Marvel-Team-Up #7
- Man-Thing in Ultimate Marvel-Team-Up #8
- Blade in Ultimate Spider-Man Super Special
- Captain America in The Ultimates #1
- Falcon in Ultimate Nightmare #1
- Captain Marvel in Ultimate Secret #1