X-Men United #3

Since a field squad of MELEE, JITTER and LAURA KINNEY accompanied CAPTAIN AMERICA on a covert mission to right a wrong from his past, nothing has gone as planned, and the squad meets their match with a mutant foe who might not ever let them get home. Meanwhile, a shadow descends over Graymatter Lane... AND THE BEAST AND MAGNETO HAVE A DIFFERENCE OF OPINION!