The X-Men #1 - X-Men

• First appearance of the original X-Men: Professor X, Cyclops, Angel, Iceman, the Beast, and Jean Grey Marvel Girl!
• First time the X-Men quarrel amongst themselves (in those days, instead of just arguing, it could get downright violent)
• First Danger Room training session (back then the Danger Room was more about obstacle courses)
• First we see of Cyclops being the strait-laced one of the group
• First time Iceman and Beast are referred to as youngest and oldest X-Men, respectively
• First time Scott shows attraction toward Jean
• First appearance of Magneto, master of magnetism, and his first battle with the X-Men
• First time mutants are referred to as "Homo superior"
• First time the villain gets away from the X-Men to fight anther day

The X-Men #2 - No One Can Stop the Vanisher

• First time Angel is shown to be such a ladies' man
• First appearance of the Vanisher
• First time the Danger Room is referred to as such
• First time the X-Men fail a mission
• First time Professor X gets directly involved in a mission
• First time the X-Men's enemy is caught

The X-Men #3 - Beware the Blob

• First time we open on a Danger Room session (the first issue had one at the beginning, but the Professor called the X-Men to report for class first)
• First time Iceman's icy form has facial features
• First time Cyclops shows dislike of his dangerous power
• First time the X-Men try to recruit another mutant
• First time Scott is confirmed to be in love with Jean, and first time he doesn't act on it because he believes his power makes him too dangerous to be close with anyone
• First signs of a definite love triangle within the team, as Angel turns out to be the prototype Wolverine who's rivaling Scott for Jean's attention
• First appearance of the unmovable Blob
• First time someone refuses to join the X-Men (though, if you ask me, Blob was still way nicer about it than those punk-ass Runaways)
• First time Beast is shown to be the brainiac of the group (Angel tells the others to get in gear, he's shown in his room reading an advanced calculus book with his foot)
• First time someone attacks the Mansion

The X-Men #4 - The Brotherhood of Evil Mutants

• First time Iceman creates one of his iconic ice slides
• First time Iceman's outer coating is melted away
• In-universe, it's the one-year anniversary of the X-Men's class beginning. The Professor surprises them with a cake!
• First appearance of Magneto's Brotherhood of Evil Mutants: the Toad, Quicksilver, the Scarlet Witch, and Mastermind the illusionist
• First time the twins refer to each other by their first names, Pietro and Wanda
• First time Quicksilver is overprotective of his sister
• First time Toad is so fiercely loyal to Magneto
• First time a past enemy returns to fight the X-Men again
• First time we see Magneto save another mutant from humans (an angry mob believing Wanda to be a genuine witch)
• First time we see the Professor and Magneto interact (conversing telepathically over the astral plane) There's nothing indicating they've ever met before, but then, there's nothing denying it either.
• First time Magneto tries to get Xavier to join his cause
• First time Magneto gains control of a nation (in this case, the tiny South American republic of Santo Marco)
• First time Xavier heroically sacrifices himself for his X-Men (he lives, thankfully)
• First time Quicksilver shows a more heroic side, destroying the fuse to the nuclear bomb Magneto activated
• First time an X-Man (Xavier himself, no less) loses their mutant power (or so it seems)

The X-Men #5 - Trapped: One X-Man!

• First time an X-Man's parents come to visit the mansion (Jean's parents, specifically)
• First Danger Room malfunction (Scott is accidentally locked in the room when it was set to Beast's test)
• First time an X-Man uses their powers offensively against the Danger Room traps (it's actually a last resort for Scott, who regrets damaging the expensive equipment but had no other choice to stay alive)
• First appearance of Asteroid M
• First we see of people rioting against mutants (though they think it's a hoax)
• First time the X-Men go on a mission without Xavier to guide them
• First time the X-Men battle the Brotherhood in Grand Central Station
• First time one of the X-Men is taken captive by an enemy

The X-Men #6 - Sub-Mariner Joins the Evil Mutants

• First issue to feature a special guest-star: Prince Namor of Atlantis, the Sub-Mariner!
• First time Jean wears her M-shaped mask, as seen on the cover

The X-Men #7 - The Return of the Blob

• The X-Men officially graduate
• First appearance of Cerebro (back then it was actually designed so someone without telepathy could locate mutants; Xavier himself had little use for it)
• Xavier officially places Cyclops in charge of the X-Men
• First time Xavier takes a leave of absence, allowing the X-Men to operate entirely without his supervision
• First time Jean is confirmed to return Scott's feelings toward her, though neither of them know how the other feels
• Blob first joins the Brotherhood
• First time the X-Men defeat an enemy without erasing his memory

The X-Men #8 - Unus the Untouchable!

• First time Iceman learns to create an outer coating of actual ice, rather than just snow
• First time people's hatred of mutants is fully shown, without people thinking it's witches or a hoax or something
• First time an X-Man quits the team (Beast)
• First mention of Lucifer
• First appearance of Unus the Untouchable
• First time Magneto is manipulating events from behind the scenes, not actually appearing in the issue
• First time an X-Man who had quit rejoins the team

The X-Men #9 - Enter, the Avengers!

• First issue to not involve Magneto's Brotherhood since their first appearance
• First time that how Professor Xavier lost his legs is hinted about
• First "retcon" of the X-Men, since back in issue #1 Xavier claims he lost use of his legs "due to a childhood accident"
• First full appearance of Lucifer
• First time the X-Men encounter the Mighty Avengers
• First time the X-Men battle another superhero team

The X-Men #10 - The Coming Of... Ka-Zar!

• First appearance of Ka-Zar and Zabu
• First appearance of the Savage Land
• First time Iceman makes a bridge

@darling_luna tagged as requested :)

Very nice achieve Webby

Keep up the good work ^_^

thanks Clay :)

@amazingwebhead: no worries friend it was a pleasure ^_^

Cool. Lot of stuff here I didn't know. Great work.

thanks

*eskimo kiss*

My favorite super hero team!

Vanisher looked like a goof back then eheh Great stuff

Very Nice!

I really want to pick up the first issues of Marvel comics such as these.

yeah, those were the good ol' days

@amazingwebhead: Spidey's series looks the best, I love the art.

Steve Ditko was one of the greats

though sometimes i can't help but wonder what if they used Jack Kirby's design

@amazingwebhead: That's an interesting design, did that gun shoot webs or bullets? The boots are too Cap'ish

i don't know, and true

Dude you should check out my blog.

http://www.comicvine.com/x-men/4060-3173/forums/x-men-read-through-blog-1558475/#757

Make more of this

i was thinking about doing one for Spider-Man or Ant-Man...

Issue number 9 could also be considered to have the first "retcon" in X-Men history, since Xavier claims he lost use of his legs in a childhood accident in earlier issues.

say, you're right! great idea!