Angry at themselves, and angry at their powers they were born with, mutants needed a leader - a man with a vision - to help them overcome their despair and see the blessing they have been given instead of the curse they thought it to be. They found that leader in Professor X. Sensing the growing movement of anti-mutant sentiment, Professor X opened up his Westchester mansion and created living and learning spaces where special mutants could be trained to use their unique gifts for the betterment of all species - before it was too late.
Professor X foresaw a future consumed by genetic war, where man and mutant would battle in a bleak wasteland once known as Earth. He knows that maintaining peace now will prevent endless warfare between man and mutant. He knows that only a handful of mutants can help stave off this devastating future.
He calls them the X-Men.
They call themselves the future's only hope.
Other the years, the X-Men have had many canges within their rosters. Members have also split and created splinter groups to protect mutantkind. When the X-Men have been disbanned or indisposed, a substitute team have taken their place.
The Nation of Krakoa
The Original X-Men
X-Men (Pre-Siege Perilous)
X-Men (Pre-X-Tinction Agenda)
X-Men (Blue and Gold Teams)
X-Men (Post-Operation: Zero Tolerance)
X-Men (Post-Messiah Complex)
The X-Men (Wolverine's Team)
The X-Men (Cyclops' Team)
The All-New X-Men
The Extraordinary X-Men (Storm's Team)
The All-New X-Men (The Time Lost Team)
The Uncanny X-Men (Magneto's Team)
X-Men: Gold (Shadowcat's Team)
X-Men: Blue (The Time Lost Team)
X-Men: Red (Jean Grey's Team)
X-Men (Cyclops' Rebuild Team)
Xavier's Secret Team
Muir Island X-Men
X-Men (Phalanx Covenant)
X-Men (Eve of Destruction)
X-Men (Planet X Street Team)
The Xavier Institute for Higher Learning
X-Force I (Cable's First Team)
X-Force (Cyclops' Strike Team)
Uncanny X-Force (Wolverine's Strike Team)
Cable and X-Force
Sentinel Squad O*N*E