Issue: #16
An X-Man has betrayed Xavier's dream and thrown in with the scoundrels of Weapon X! Who is it and why - and what do the X-Men intend to do about it?
Creators: Frank Tieri, Don Hillsman II, Georges Jeanty, Dave Sharpe, Stephanie Moore, Jeff Johnson, Tom Chu, Mike Marts, Cory Sedlmeier, Joe Quesada
Characters: Magneto, Wolverine, Mr. Sinister, Sauron, Chamber, Sublime, Fantomex, Gayle Edgerton, Wild Child, Maverick, E.V.A, Brent Jackson, Xorn
Story arcs: Defection