New Mutants: Return of Legion

In this 2009 one-shot from Marvel, the New Mutants confront a dangerous return from David Haller's fractured psyche as Legion resurfaces. Adam Kubert's artwork anchors this single-issue story, which serves as a pivotal moment for the team. It matters as a key chapter in the broader X-Men mythos, exploring the consequences of a powerful mutant mind's instability.