Dark Heart Justice League Unlimited : Season 1 Episode 10
TV-Y7-FV Cartoon Network 23m
Aired: December 11th, 2004 @ 10:30 PM EST on Cartoon Network
Most of the League battles with powerful alien nanotechnology but, realize that the waves of self-replicating robots cannot be simply destroyed. The diminutive Atom shrinks himself to stop the robots from the inside.
