The second story arc in the great Ultimate Universe trilogy that began with Ultimate Nightmare! A hidden alien race is trying desperately to keep Man from reaching the stars. Cape Canaveral scientist Phillip Lawson knows of the hideous plan and will use all his considerable power to stop it...the power of Captain Mahr Vehl! While the Kree shock troops send regiment after regiment to strike at the secret S.H.I.E.L.D. facility, the Ultimates and the Ultimate Fantastic Four infiltrate the alien mothership to learn who?or what?Gah Lak Tus is! And believe us when we say they get more than they bargained for!