Justice League Unlimited S01E10 - Dark Heart
Justice League Unlimited (2004)
S01E10 Dark Heart
Episode Overview
Title: Dark Heart Plot: The League faces off against formidable alien nanotech, only to discover that the relentless swarm of self-replicating machines cannot be annihilated easily. In a daring move, the tiny Atom reduces his size and ventures inside the robotic horde to dismantle them from within.