New Mutants, Volume 3: Fall of the New Mutants
To Hell...and back? As the New Mutants struggle to pick up the pieces after their toughest battle ever, a new enemy called Project Purgatory has the team in its crosshairs, and the New Mutants suddenly find themselves dragged away from vacation and into the hellish dimension of Limbo. The secret they uncover there will shock them!
Collects New Mutants #15-21.