Mark Millar is a Scottish comic book writer. His first job as a comic book writer came when he was still in high school

MARINA FISHER is a staff engineer at Sun Microsystems. As a Sun Certified Enterprise Architect for Java EE, she provides Sun’ s Fortune 500 customers with assistance in architecting, designing, implementing, and deploying large-scale enterprise applications. Her background spans across financial, retail, manufacturing, and other sectors, with emphasis on Service Oriented Architecture (SOA), interoperability, and application security. RAY LAI, a principal engineer from Sun Microsystems Chief Technologist’ s Office, specializes in financial services and SOA solutions. He has developed and architected enterprise applications for leading multinational companies around the globe. He is also the author of the book, "J2EE Platform Web Services," and coauthored "Core Security Patterns," His current technology focus includes application security and JSF/AJAX-style prototyping. SONU SHARMA is an engagement manager with Client Solutions Organization at Sun Microsystems Inc. Sonu specializes in managing, architecting, and implementing scalable, reliable, and high-performance business critical enterprise applications using Java EE and XML Web Service technologies for Sun’ s Fortune 500 customers. Prior to working at Sun, Sonu has worked on architecting, designing, and building enterprise solutions in the fields of e-commerce, banking, and insurance. LAURENCE MORONEY is the director for technology evangelism for Mainsoft where he is responsible for sharing and shaping their unified .NET and Java EE architecture to enable and empower interoperability. Prior to Mainsoft he worked as a Senior Architect in the Reuters CTO office where he worked on research into WebServices Interoperability, Social Computing, and Trading Networks. Author of several books on Web Services and .NET, as well as dozens of technology articles, Laurence is based in Sammamish, Washington.

Born in pre-revolutionary Cuba, David Finch is the only son of Canadian missionaries. After completing a portion of his education in Canada and Venezuela, Finch came to Canada for good and earned a master's degree in post-confederation Canadian history at the University of Calgary. He presently lives in Calgary with his wife and daughter. In his spare time David likes to canoe, cross-country ski and hike in the Canadian Rockies. He builds and restores canoes and has a fine collection of watercraft.

Artist Adam Kubert, who also contributed to the previous Ultimate X-Men volumes, hails from a long legacy of renowned Kubert illustrators. His dynamic pencils and attention to realism provide the X-men with a compelling, cinematic flair.

The Ultimates vs. the Ultimate X-Men: the battle begins. When the X-Men do the worst thing they could to humanity, the government orders Captain America, Iron Man, Thor, and the rest of the Ultimates to bring them down.