The First Twelve Issues Of John Byrne's Fan-Favorite X-Project Are Collected For The First Time In One Titanic Tome! This Fan-Favorite Series Chronicles The Adventures Of Marvel's Original Team Of Merry Mutants After Their Silver Age Saga Had Run Its Course And Before The Launch Of The All-New, All-Different X-Men. Thrill To Their Explosive X-Ploits In The Savage Land, As Well As Guest Appearances By Ka-Zar, Magneto, Sauron, The Brotherhood Of Evil Mutants And Namor! Collecting X-Men: The Hidden Years #1-12 And Material From X-Men (1991) #94.