Marvel Premiere Classic Library Edition #21. Collects Uncanny X-Men #125-128, and material from X-Men Classic (1986-1995 Classic X-Men) #32-33 and 36. Written by CHRIS CLAREMONT, JOHN BYRNE, ANN NOCENTI and FABIAN NICIEZA. Art by JOHN BYRNE, JOHN BOLTON and MARK BRIGHT. Cover by DAVE COCKRUM. One of the X-Men's greatest allies must face her darkest secret when a child born of violence bends reality to his whims! The paranormal Proteus battles the X-Men in body and soul, shaking the psyches of even their bravest and strongest! But as Marvel's mightiest mutants face one world-threatening wonder, an even worse one awaits as the stage is set for the debut of Dark Phoenix! Hardcover, 128 pages, full color. Cover price $19.99.