Secret Empire Underground

In the aftermath of Hydra's takeover of the Marvel Universe, Secret Empire Underground (2017, Marvel) is a single-issue tie-in that follows a team of heroes trapped beneath the surface, struggling to survive and resist. Illustrated by RB Silva, this story expands the scope of the larger Secret Empire event by spotlighting the hidden battles fought away from the main front. It matters as a focused, claustrophobic chapter that deepens the stakes of one of Marvel's most controversial modern sagas.