Collecting the groundbreaking first year of the Ultimate X-Men in one colossal trade paperback! The world stands on the brink of genetic war, Mankind has made the first move, launching an army of giant, cybernetic executioners called Sentinels--programmed to target and eliminate the mutant DNA strand. Now, Magneto and his mutant terrorist cell are preparing to follow through on their threats of Homo sapien genocide. The only force that can prevent total annihilation: five awkward teenagers and their crippled mentor!