Solar: Man of the Atom #11 (10 Copy Laming B&W Cover)
Even when you can do basically anything, saving the entire world is a tall order. But Erica doesn't have much choice, because EVERY NUCLEAR MISSILE on Earth has been activated and primed to wipe out civilization. It's up to her and her dad (and her dad's math) to keep the flying things that blow up from blowing up.
