Lieber: Underground is all about the irrevocable consequences of a few bad decisions. You can do a lot of things in a shared superhero universe, but irrevocable consequences? No such thing. For that, you’ve got to tell your own story.
Parker: In issue one, Wes tries to tell the people of Marion how one wrong move in a cave can destroy a delicate crystal formation that took fifteen-thousand years to develop. She’s right, but their community’s fragile, too, and if they don’t take action to save it, it’s gonna fall apart. There are moments like that in every life, where the wrong choice can send things spiraling out of control, changing things forever. You can’t tell that story in a world where Superman can spin the earth backward, in clear defiance of Marlon Brando’s sternest warnings.