1st appearance of Hercules

1st appearance of Zeus

Versions of the Olympians have appeared previously in different Timely and Marvel comics but the versions of the characters introduced here consistently maintain an ongoing continuity

First battle of Thor vs Hercules

[August 2022 - rumored solo project in the works titled Hercules: Rise of the Gods]

1st appearance of Eternity, twin brother of Infinity

[July 2022 - Marvel recently trademarked the titles Avengers: Eternity Wars and Eternity Saga]

1st appearance of Ajak, a member of the sub-group known as the Polar Eternals

1st appearance of Arishem the Judge, a Celestial

The Celestials sink the Kingdom of Lemuria and as a result, Atlantis is also sunk

[July 2022 - Marvel recently trademarked the title Celestials: End of Time]

The first incursion occurs, the collision of alternate Universes with Earth being the point of impact

[July 2022 - Marvel recently trademarked the title Avengers: Excursion]

1st appearance of Hazmat, a woman confined to a hazmat suit who exudes radiation and other deadly substances

1st appearance of Mettle, a skinless, armored mutant

1st appearance of Striker, fame-obsessed mutant

1st appearance of Veil, a young woman with the ability to transform into a gaseous state

1st appearance of Finesse, a polymath with powers similar to Taskmaster who is suspected of being her father

[July 2022 - Marvel recently trademarked the title Avengers Academy]

1st appearance of the Red Guardian, Alexi Shostakov- husband of Natasha Romanova, the Black Widow

[July 2022 - Marvel recently trademarked the title Red Guardian: Generations / September 2022 - confirmed for the Thunderbolts movie]

1st team appearance of the Runaways: Alex Wilder, Karolina Dean aka Lucy in the Sky, Molly Hayes aka Bruiser, Nico Minoru aka Sister Grimm, Chase Stein aka Talkback, Gertrude Yorkes aka Arsenic

1st team appearance of the Pride

[July 2022 - Marvel recently trademarked the title Runaways: New Era]

1st appearance and death of Wonder Man, later resurrected

[June 2022 - official series announced featuring Wonder Man for Disney+ with Destin Daniel Cretton (Shang-Chi) directing]

1st appearance of Avatar, Franklin Richards as an adult

[May 2022 - speculation Franklin will be introduced in the MCU possibly leading to a Future Foundation team]

1st appearance and origin of Steve Rogers as Nomad

1st appearance of Hugh Jones, president of Roxxon

Madame Hydra, becomes Viper

Death of the first Viper

First mention of the oil conglomerate, Roxxon

Nine-issue series that follows Wiccan (Billy) and Speed (Tommy) search for the Scarlet Witch who had been missing since the events of House of M

[March 2022 - rumor that unannounced MCU projects could borrow heavily from this story arc]

1st full appearance and cover appearance of Tyrant

1st appearance and origin of Ghost Rider, Robbie Reyes

[December 2021 - Gabriel Luna seems to be teasing a reprisal of his Ghost Rider role in response to a tweet from BossLogic]

Five-issue series continuing from the Planet Hulk story arc

This issue is preceded by the World War Hulk Prologue

1st appearance of a Super Skrull disguised as Blackbolt, revealed as a Skrull in New Avengers: Illuminati #5

Debut of Iron Man's 'Hulkbuster II' armor

[October 2021 - there is a lot of online chatter that a World War Hulk movie is slated for production but due to the Planet Hulk story mostly told in Thor: Ragnarok, we could only assume that a rumored movie would be in title alone]

2nd appearance of Drax the Destroyer

3rd appearance of Thanos

1st full appearance of Eros, later named Starfox by Wasp in Avengers #232

[January 2022 - an unconfirmed Eros MCU spin-off project is rumored]

Eros renamed Starfox by Wasp

Starfox joins the Avengers

1st appearance of Lucia Von Bardas, the Latverian successor of Doctor Doom

[June 2020 - rumored to appear in the MCU introducing Latveria and eventually Doom]

1st team appearance of the Council of Kangs

1st appearance and death of a Kang variant that killed the Avengers in an alternate timeline

1st appearances of unknown Kangs and Kang robots

[July 2021 - potential of multiple Kang variants to be introduced in the MCU]

1st team appearance of Winter Guard: Red Guardian, Vanguard, Sibercat, Darkstar, Vostok (Sputnik), Fantasma

1st appearance of Blackout, one of the Lilin

[May 2021 - rumored that Marvel has plans for a Midnight Sons show with Blackout as the villain. This news is unconfirmed]

1st appearance of Captain Britain in U.S. comics

1st cameo appearance of Arcade

[2019 - the name Braddock mentioned by Peggy Carter in Endgame could be Sir James Braddock, the father of Captain Britain, Psylocke and Monarch who worked with S.H.I.E.L.D. in The Ultimates comics]

1st cameo team appearance of The Nine aka the Midnight Sons: Ghost Rider(Ketch), Johnny Blaze, Morbius, Blade, Hannibal King, Frank Drake, Sam Buchanan, Victoria Montesi, Louise Hastings

1st appearance of the Caretaker

1st appearance of Lilith, mother of demons

1st appearance of Meatmarket, offspring of Lilith

[July 2021 - reports that Marvel registered the LLC, Richmond Street Productions for a streaming series leading speculators to believe that it is a reference to the location of the cemetery where Dan Ketch was resurrected as the Ghost Rider / July 2022 - Midnight Sons was trademarked by Marvel along with other titles that are proven to be official]

Premiere issue of a six-issue series about a war over nanotechnology between two powerful scientists, Gabriel and Deadalus, from the extra-dimensional world of New-Gen

[October 2020 - voice actors for animated series include: Lena Headey, Henry Rollins and Luke Wilson]

1st appearance of Madcap

[March 2021 - speculated to appear in Deadpool 3]

1st team appearance of the Council of Reeds, a gathering of Reed Richards' from different dimensions

[November 2020 - speculation that the Council of Reeds could appear in the MCU as different dimensions are introduced]

1st cameo appearance of Singularity

1st unofficial team appearance of A-Force, team officially named in A-Force #4

1st appearance and origin of Nova, Richard Rider

1st appearance of Rhomann Dey, Corpsman of the Nova Corps

1st appearance of Robbie Rider, brother of Nova

[January 2021 - the MCU maintains their intention to use Nova (Alexander & Rider) in a film / March 2022 - Deadline reports a source confirms a Nova project is in development]

1st team appearance of the Secret Warriors: Nick Fury, Phobos, Slingshot, Quake, Stonewall, Hellfire and Druid

1st appearance of Stonewall, son of the Absorbing Man

1st appearance of Druid, son of Doctor Druid

1st appearance of Hellfire, descendant of the Phantom Rider

1st appearance of Yo-Yo Rodriguez aka Slingshot

Cover art inspired by Avengers #16

[May 2020 - Secret Warriors team is rumored to appear in the MCU]

1st appearance and origin of Werewolf by Night

[November 2021 - actor Gael Garcia Bernal cast as Werewolf By Night in a Marvel Studios Disney+ TV special]

1st appearance and origin of Ghost Rider, Johnny Blaze

1st appearance of Quasar, formerly Marvel Man

[June 2017 - James Gunn tweets an image of a Quasar brand VCR. Although this issue is representing the speculation, it is just as likely they use the female version of Quasar, Avril Kincaid if the character is introduced to the MCU]