Common to the Millar period was an edgy tone, featuring quick action-driven plots and less moral X-Men. For instance, Wolverine tries to kill Cyclops in "Return of the King" because he is envious of Jean's love. In an interview with "Sequential Tart", Millar commented, "You're not competing with Cartoon Network on these books; you're competing with 'Buffy'...Superhero comics aren't adult, but they shouldn't be written for five-year-olds either." Millar shaped "Ultimate X-Men" into a commercial hit, consistently outselling its sister titles, "X-Treme X-Men" and "Uncanny X-Men" and staying just behind Grant Morrison's experimental and popular "" run.