The X-Men #121

Published by Marvel Comics in May 1979, The X-Men #121 serves as a pivotal chapter in the 'Dark Phoenix Saga,' written by Chris Claremont with pencils by John Byrne and inks by Terry Austin. This issue marks the first full appearance of Alpha Flight, the Canadian superhero team introduced to track down Wolverine, who had previously left the X-Men to fulfill his obligations to the Canadian government. The creative team utilized this issue to expand the X-Men's global scope, placing the mutant team in the unfamiliar setting of Calgary and the Canadian wilderness to heighten the tension between Wolverine and his former handlers.

The design and narrative approach of this era, characterized by the legendary collaboration of Claremont and Byrne, was centered on deep character development and long-form storytelling. By integrating Alpha Flight, the creators added significant lore to the Marvel Universe, grounding Wolverine's mysterious past in a tangible reality. Upon its release, the issue was well-received for its balanced mix of action and personal stakes, helping solidify the X-Men's rising popularity as Marvel's flagship title during the late 1970s.