Apocalypse

A former horseman, Archangel betrayed Apocalypse at a critical moment, turning the tide for the X-Men.

Apocalypse is responsible for the dire condition of Blink's home reality. It is his genetic research "pens" that housed a young Clarice Ferguson.

Caliban is a mutant that can sense other mutants within a 25 mile radius of himself. Caliban has had his powers altered by Apocalypse more than once. Caliban wavers between despising what Apocalypse turned him into and sworn allegiance to him.

Cyclops has "killed" Apocalypse on more than one occasion throughout history. Apocalypse infected Cyclops' son with a techno-organic virus, forcing Cyclops to send the boy into the future where he would become Cable.

Emma Frost was formerly known as the White Queen from the notorious Hellfire Club. She is currently headmistress of the Xavier Institute along with Cyclops.

Gambit is a thief turned X-Man. He is constantly weighing his carefree life of crime with a pursuit of justice alongside the X-men. He is also Cajun and speaks with a New Orleans Accent.

Younger brother to Scott Summers, Cyclops, older brother to Gabriel Summers, Vulcan, and son of Christopher Summers, Corsair. Former leader of X-Factor, and now an intergalactic team of X-Men.

Dr. Robert Bruce Banner is the Incredible Hulk. Exposed by gamma radiation, he transform when he gets angry, you wouldn't like him when he is angry

Apocalypse is one of the most powerful mutants in the Marvel universe, possessing a multitude of superhuman abilities, including almost unsurpassed strength, invulnerability and the ability to both shift and alter his mass and form.

Jubilee encountered and fought Apocalypse while serving with the X-Men.

While both Apocalypse and Magneto believe mutants to be superior to normal human beings, Apocalypse philosophy of "Survival of the Fittest" is diametrically opposed to Magneto's goal of the protection and advancement of all mutant-kind. Apocalypse attempted to steal Magneto's powers in "The Twelve" storyarc.

Even though Apocalypse is the one who manipulated Essex's DNA to make him into Sinister, Sinister has always seen Apocalypse as an enemy. Sinister feels restricted by Apocalypse and the one holding him back, since Apocalypse sees Sinister as his servant and meant to do HIS work. Sinister eventually decided that he would find a way to defeat the mighty immortal. Eventually this came to him after his studies of the Summers bloodline, through Scott Summers. Sinister believed that if Scott and Jean Grey would have a child it would be powerful enough to defeat Apocalypse. And so Madelyne Pryor was created and Cable was born, the child bred to defeat Sinister's enemy Apocalypse.

Pulse has the mutant power, similar to Leach's, but that allows him to shut off or turn off or pulse out other mutant's powers. Mystique tried to set him up with Rogue.

Rama-Tut (aka Kang) was the tyrannical ruler of Egypt during the time that Apocalypse was born and first realized his mutant powers. Tut sought the annihilation of the tribe that raised Apocalypse- the Sandstormers.

En Sabah Nur sought out Saul, a fellow immortal mutant that coveted the Celestial spacecraft that would become X-Factor's Ship. Nur defeated Saul and entered the ship, later emerging and dubbing himself "Apocalypse".

An advance ship created from the mix of Celestial technology and Askani future technology

Stryfe was a clone created by the Askani, kidnapped by Apocalypse and raised under his protection and (mis)guidance. Apocalypse hoped to use the Chaos-Bringer as a future vessel. Stryfe became bitter after being abandoned following Apocalypse's fall and upon time traveling to the present, nearly killed Apocalypse during his X-Cutioner's Song masterpiece, wining the allegiance of his Dark Riders.

Thunderbird was one of the new X-Men introduced in Giant-Size X-Men #1. He died shortly after on one of his first missions.

Gambit of Earth-1191 who became an immensely powerful figure of that time.

Cloned from Wolverine's DNA, X-23 has had anything but an easy life. Now in the New X-Men, she is beginning to find her place.