X-Treme X-Men #21

X-Treme X-Men #21, released in early 2003, serves as a pivotal entry in the series written by Chris Claremont with interior art by Salvador Larroca. The series emerged during a period of significant reorganization for the X-Men franchise, intended to provide a more global, globe-trotting alternative to the core titles of the era. It captured a moment of creative experimentation where established characters were placed in unconventional roles, moving away from the confines of the Xavier Institute.

The design of this era was heavily defined by Larroca's sleek, detailed style, which brought a distinct visual cohesion to the team's disparate costumes and settings. By issue 21, the book was deep into the 'Prisoner of Fire' arc, reflecting Claremont's penchant for long-form, character-driven storytelling. While the series was often viewed as a stylistic outlier compared to Grant Morrison's concurrent New X-Men, it remains a notable piece for its exploration of internal team dynamics and its departure from traditional team headquarters.