Stryker's rampage against all of mutantkind escalates in your first look at Ultimate Comics X-Men #4 from the creative team of Nick Spencer and Paco Medina! With the number of mutants still on the run dwindling down, the new X-Men must act quickly if there is any hope of survival. Except when tensions rise amongst the group - a traitor may be in their midst. Can Stryker be stopped and can the X-Men hold it together in time to save their race? Find out in Ultimate Comics X-Men #4!