Because the X-Men were introduced as an already-formed team, their individual origins came out later in a series of back-up stories showing how Xavier recruited them. Jack O'Diamonds was a criminal who tried recruiting the runaway Scott Summers as a partner-in-crime. Jack's madness soon became apparent, though, and the young Cyclops instead helped Charles Xavier fight against the Living Diamond. Jack seemingly died, but he reappeared in the Krakoan Era in a flashback story set shortly before Giant-Size X-Men #1, where... he died again. Okay. Cool.
Welcome to UXN! 24 Years and still for the fans, by the fans!
Profile On... MAHA YOGI!
One of Marvel's oldest mutants, this villain debuted in Thor's feature the same month as X-Men #1 in 1963. However, he has struggled desperately to find a place ever since. The idea that Merlin was the first evil mutant didn't last, so he was renamed the Warlock and confirmed as an imposter of the real Merlin. He next used a stage name as the Maha Yogi...which somehow became his latest codename as well. Then his mutant powers weren't as important as his ties to the Caretaker of Arcturus (Remember them? Don't lie!) or his fragment of the Bloodgem, or Peter David losing a bet and having to write a story with Red Raven. Nearly 25 years later, "Merlin II" has yet to return from his last evil scheme.
Profile On... LOCUST!
APRIL FOOLS! Just kidding...these guys are idiots. This week is a highlight reel of some of the X-Men's oldest (but lamest) villains. Arguably the X-Men's first real "miss" of a villain, Dr. August Hopper was an insect-obsessed scientist with no mutant abilities or ties to the X-Men's growing lore. The Locust could just as easily have popped up in Tales to Astonish or Amazing Spider-Man, but instead he got used here. Last seen over 20 years ago, the biggest challenge the Locust offered the original X-Factor was remembering who he was!
GREATEST VILLAINS WEEK
This week! On UncannyXmen.net! A celebration! A rogues gallery of fearsome foes who have gone unheralded for years, but have stymied the X-Men since the earliest days. Tremble before their might! Witness their power! And ready yourselves for a week of terrifying villains the likes of which this world have never seen!

Update On... STRYFE!
"Stryfe is dead!!" ...boy, if I only had a nickel for each time we've heard that. As a follow-up to Cable's Update, today we focus on his twisted twin, the Chaos-Bringer. Stryfe has returned from certain death multiple times now, through new bodies or time loops or both. He is anarchy incarnate and the very concept of Stryfe seems enmeshed into the timeline, a bad penny that will always turn up from one history or another to threaten Cable in the past, present, and future.
Update on... CABLE!
Well... that was complicated. Marvel finally resolved the time paradox of the Original Five X-Men by introducing a time looped "Kid Cable" to send them home. Organizing Cable's personal timeline challenged the very concept of cause-and-effect, but at least the kid seems to have returned to his appropriate time now, and the old man is back again. Now that his past is reconciled and his daughter is lost, though, it remains to be seen what Cable will do "next."