The Brave and the Bold #53

The Brave and the Bold #53 pairs two of DC's most intriguing heroes — the Atom and the Flash — in a team-up titled "The Challenge of the Expanding World." Bob Brown's cover captures a desperate moment: a straining Flash, arms outstretched, cries out that he's losing speed while a tiny Atom rides along his arm, both caught in what appears to be a vast, swirling green vortex threatening to swallow them whole. It's a wonderfully tense 1964 Silver Age image that makes you want to flip straight to page one.