Rachel Anne Summers is a fictional character appearing in American comic books published by Marvel Comics. The character was created by writer Chris Claremont and artist/co-plotter John Byrne.
Sage, also known as Tessa, is a character appearing in American comic books published by Marvel Comics. She has most often been associated with the X-Men and the Hellfire Club, whom she spied upon for Professor Charles Xavier.
Katherine Anne "Kitty" Pryde is a superhero appearing in American comic books published by Marvel Comics, commonly in association with the X-Men. The character first appeared in The Uncanny X-Men #129 and was co-created by writer-artist John Byrne and writer Chris Claremont. A mutant, Pryde possesses a "phasing" ability that allows her to pass through objects, hence she is intangible while using this ability. This power also disrupts any electrical field she passes through, and lets her simulate levitation.
Sebastian Hiram Shaw is a supervillain appearing in American comic books published by Marvel Comics. He has been frequently depicted as an adversary of the X-Men.
The Hellfire Club is a fictional society appearing in American comic books published by Marvel Comics. The Hellfire Club often comes into confrontation with the X-Men mutant superhero team. Although the Club appears to merely be an international social club for wealthy elites, its clandestine Inner Circle seeks to influence world events and advance their agenda.
Emma Grace Frost is a character appearing in American comic books published by Marvel Comics. Created by writer Chris Claremont and artist/co-writer John Byrne, the character first appeared in The Uncanny X-Men #129. She belongs to a subspecies of humans called mutants who are born with superhuman abilities. Her mutation grants her high-level telepathic abilities and the power to turn into organic diamond. Emma Frost has evolved from a supervillain and foe of the X-Men to becoming a superhero and one of the team's most central members and leaders. The character has also been known as the White Queen and the Black King at various points in her history.
Several fictional groups of mutants have used the name Hellions in American comic books published by Marvel Comics. The Hellions have always been portrayed as rivals of various teams of younger mutant heroes in the X-Men franchise, initially as actual villains and later on a team that was more of a school rival than actual enemies of the X-Men.
X-Treme X-Men is the name of two comic book series published by Marvel Comics, the first from 2001 through 2004, and the second from 2012 through 2013. All 46 issues of the first series were written by Chris Claremont, and featured a globetrotting X-Men team led by Storm. The first 24 issues were drawn by Salvador Larroca, and the final 22 issues were drawn by Igor Kordey.
Mastermind is a supervillain appearing in American comic books published by Marvel Comics, commonly as an adversary of the X-Men. The original Mastermind was a mutant with the psionic ability to generate complex telepathic illusions at will that cause his victims to see whatever he wishes them to see. He was a founding member of the first Brotherhood of Evil Mutants and later a probationary member of the Lords Cardinal of the Hellfire Club, where he played an important role in "The Dark Phoenix Saga".
Cerebro is a fictional device appearing in American comic books published by Marvel Comics. The device is used by the X-Men to detect humans, specifically mutants. It was created by Professor X and Magneto, and was later enhanced by Dr. Hank McCoy.
Donald Pierce is a supervillain appearing in American comic books published by Marvel Comics. The character is depicted as a cyborg and is commonly an enemy of the X-Men.
Selene Gallio is a supervillain appearing in American comic books published by Marvel Comics. Created by Chris Claremont and Sal Buscema, the character first appeared in New Mutants #9. Selene belongs to the subspecies of humans called mutants, who are born with superhuman abilities. She is often associated with the Hellfire Club's Inner Circle and is despised as an enemy of the X-Men.
Cassandra Nova Xavier is a supervillain appearing in American comic books published by Marvel Comics, most commonly in association with the X-Men. Created by writer Grant Morrison and artist Frank Quitely, Cassandra first appeared in New X-Men #114. Cassandra is a mummudrai, a parasitic life form born bodiless on the astral plane.
Empath is a fictional mutant character appearing in American comic books published by Marvel Comics. The character is usually depicted as possessing the ability to control emotion in other people.
Trevor Fitzroy is a supervillain appearing in American comic books published by Marvel Comics. The character is usually depicted as an enemy of the X-Men, in particular Bishop. Created by Jim Lee and Whilce Portacio, he first appeared in The Uncanny X-Men #281.
Firestar was a four-issue comic book limited series, published in 1986 by Marvel Comics, that established the origin story of the Firestar character within Marvel Comics continuity.
The Upstarts are a group of supervillains appearing in American comic books published by Marvel Comics. The characters have strong ties to the Hellfire Club. They first appeared in Uncanny X-Men #281 and were created by Jim Lee and Whilce Portacio.
Harry Leland, also known as the Black Bishop, is a supervillain appearing in American comic books published by Marvel Comics. The character has been depicted as an adversary of the X-Men.
"Necrosha" is a 2009–10 comic book crossover storyline published by Marvel Comics featuring the X-Men family of characters. In the storyline, Selene decides to utilize the techno-organic virus’s power to bring any deceased mutant back to life, allowing her to begin her quest to ascend to godhood. This prompts multiple mutant teams to fight against Selene in an attempt to free the newly resurrected mutants. The storyline is notable for reviving a vast majority of its characters.
Marauders was the title of two ongoing comic book series published by Marvel Comics beginning in 2019 starring the X-Men.
