Written by JEFF PARKER & ROGER LANGRIDGE Penciled by NICK DRAGOTTA, ROGER CRUZ, COLLEEN COOVER, PATRICK SCHERBERGER, MICHAEL CHO, ROGER LANGRIDGE, NICK KILISLIAN, DEAN HASPIEL, DAVID WILLIAMS & JEFF PARKER Cover by CARLO PAGULAYAN For millions of years, mankind's place on Earth was unchallenged - until five young people paved the way for a new kind of human! While students at the Xavier School for Gifted Youngsters, Cyclops, Marvel Girl, Angel, Beast and Iceman taught the world what it meant to be X-Men. These are the hidden stories of the team that laid the foundation of a mutant dynasty! In this volume, the fledgling X-Men encounter MACHINE MAN, MEDUSA and the enigmatic MYSTERIO! Guest starring SPIDER-MAN and the FANTASTIC FOUR! Plus, the Beast starts conducting investigations into his own 'X' files around the world! Are there aliens among us- or things even weirder? Collecting X-MEN: FIRST CLASS #11-16 and GIANT-SIZE X-MEN: FIRST CLASS #1. 168 PGS.