Event

Age of Apocalypse
What Happened
David Haller the son of Professor Charles Xavier and also a powerful psionic mutant known as Legion traveled back into time to kill his father's greatest nemesis Magneto before the men would become enemies.  Xavier attempted to save his friend and lost his life thus ironically erasing Haller's existence.  Xavier's sacrifice convinced Magneto of his friend's dream of mutants and humans coexisting in harmony and he eventually formed the X-Men in his quest of this dream.

Before Magneto could fulfill his quest of a human and mutant utopia the ancient mutant known as Apocalypse initiated a genetic war to fulfill his quest to create a world where on the strong survive.

Bishop traveled back in time to prevent this version of the future from ever occurring and many other mutants took refuge in other timelines and realities before a final nuclear holocaust destroyed the Earth.

Notable Deaths, Destruction or Introduction

Death

Professor X

Destruction

All life on Earth.

Introduction

Blink

Brotherhood of Chaos

Dark Beast

Holocaust

Pale Riders

X-Man

Creators

Writers

Brian K. Vaughan

Fabian Nicieza

Howard Mackie

Jeph Loeb

John Francis Moore

Larry Hama

Mark Waid

Scott Lobdell

Terry Kavanagh

Warren Ellis

Artists

Adam Kubert

Alan Davis

Chris Bachalo

Chris Warner

Dan Green

Ian Churchill

Joe Bennett

Joe Madureira

Karl Kesel

Ken Lashley

Roger Cruz

Salvador Larroca

Steve Epting

Steve Skroce

Terry Dodson

Tim Sale

Tom Lyle

Tony Daniel

Trevor McCarthy

Val Semeiks

Pertinent Issues in Recommended Order
X-Men Chronicles #1 & 2 (March & June, 1995)

Tales of the Age of Apocalypse #2 (Dec. 1997)

X-Man #-1 (July, 1997)

X-Man Annual '96 (1996)

Tales of the Age of Apocalypse #1 (Dec. 1996)

Blink #1 - 4 (March - June, 2001)

X-Men Alpha (Feb. 1995)

Generation Next #1 (March, 1995)

Astonishing X-Men Vol. 1 #1 (March, 1995)

X-Calibre #1 (March, 1995)

Gambit and the X-Ternals #1 (March, 1995)

Weapon X #1 (March, 1995)

Amazing X-Men #1 (March, 1995)

Factor X #1 (March, 1995)

X-Man Vol. 1 #1 (March, 1995)

Amazing X-Men #2 (April, 1995)

Factor X #2 (April, 1995)

Weapon X #2 (April, 1995)

Gambit and the X-Ternals #2 (April, 1995)

X-Calibre 2 (April, 1995)

Astonishing X-Men Vol. 1 #2 (April, 1995)

Generation Next #2 (April, 1995)

X-Man Vol. 1 #2 (April, 1995)

Age of Apocalypse: The Chosen (April, 1995)

Astonishing X-Men Vol. 1 #3 (May, 1995)

Factor X #3 (May, 1995)

Amazing X-Men #3 (May, 1995)

X-Calibre 3 (May, 1995)

Weapon X #3 (May, 1995)

Gambit and the X-Ternals #3 (May, 1995)

X-Universe #1 (May, 1995)

Generation Next #3 (May, 1995)

X-Man Vol. 1 #3 (May, 1995)

Astonishing X-Men Vol. 1 #4 (June, 1995)

Generation Next #4 (June, 1995)

X-Calibre #4 (June, 1995)

X-Man Vol. 1 #4 (June, 1995)

Factor X #4 (June, 1995)

Gambit and the X-Ternals #4 (June, 1995)

Amazing X-Men #4 (June, 1995)

Weapon X #4 (June, 1995)

X-Men Omega (June, 1995)

X-Universe #2 (June, 1995)

X-Men Prime (July, 1995)