Ultimate X-Men #5

ULTIMATE X-MEN #5 - (Millar/Kubert/Thibert) Betrayed by a persecuting humanity and in a state of emotional pain, one of Professor X's students has turned his (or her) back on the X-Men and joins Magneto's Brotherhood. How will the remaining team members deal with this betrayal?

Image: Ultimate X-Men #5 - Marvel Comics

Ultimate X-Men #5