In the now-grand tradition of Hero Initiative's previous and wildly successful "100 Project" books, Marvel's merry mutants now come to the fore! All of Hero's 104 original covers to Marvel Comics' Uncanny X-Men #12 are on display in this great book, with art by John Cassaday, Alan Davis, Dale Keown, Adam Kubert, George Pérez, John Romita, Joe Sinnott, and more!