Murderworld was designed by the Arcade to carry out assassinations using various carnival-themed robotics and traps.

Black Tom is a mutant whose principal power is the ability to generate and discharge concussive blasts of force and heat through any wooden medium. He typically carries a shillelagh, a traditional Irish wooden fighting stick, which he uses to focus his power. He is immune to his cousin Banshee's sonic powers.

Magik, the younger sister of Colossus, was kidnapped by the demon lord Belasco who meant to use her to free himself from Limbo. The X-Men managed to rescue her, but somehow, in a tug-of-war between dimensions, she aged seven years.

Wolverine was engaged to Mariko Yashida, the Silver Samurai's half-sister, but their wedding was halted by the supervillain Mastermind, who used his telepathic powers to change Mariko's mind.

Following orders from the President, Henry Peter Gyrich, an agent of the National Security Council, took the neutralizer. Forge protested because the device was untested and extremely dangerous. Gyrich intended to use the neutralizer against Rogue, who was wanted for allegedly killing a S.H.I.E.L.D. agent, but instead used it to remove Storm's powers.

Donning a trenchcoat and fedora to disguise himself, the Beast was shocked to find that the performers at Mr. Mike's One-Ring Traveling Tent Show were actually the hypnotized X-men!

Professor X uses his ancestral mansion at 1407 Graymalkin Lane as a base of operations for the X-Men.

Raised in an alternate timeline version of Professor Charles Xavier's School for Gifted Youngsters, Rachel Summers met and befriended fellow mutant Franklin Richards, the son of Fantastic Four members, Mr. Fantastic and Invisible Woman. When her powers manifested, Rachel joined the New Mutants, a younger generation of X-Men brought together to carry-on Professor Xavier's dream of a peaceful co-existence between humans and mutants.

Colossus became infatuated with the alien healer Zsaji who sacrificed herself to save the heroes. Still grieving when he returned to Earth, Colossus ended his romantic relationship with a heartbroken Kitty Pryde.

When Forge saw his company slain by the North Vietnamese, he tapped into his long-suppressed shamanic heritage to summon the Adversary to destroy the attackers. After regaining his senses, he attempted to banish the demon, but it had a foothold on Earth thanks to Forge's impulsive actions.