Ultimate X-Men #4 (April 2001) is 'The Tomorrow People: Part 4 of 6 - Betrayal,' written by Mark Millar with pencils by Adam Kubert. Casualties mount as the X-Men's fight with the Brotherhood worsens, and Wolverine and Jean Grey's relationship drives Cyclops to a fateful decision. 'Return of the King' is a separate later story arc collected in Vol. 6 and does not correspond to issue #4.