Justice League Unlimited
S01E10 Dark Heart
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.
Season 1 Episodes
1
2
3
4
5
6
7
8
9
10
11
12
13
Initiation
For the Man Who Has Everything
Kid Stuff
Hawk and Dove
This Little Piggy
Fearful Symmetry
The Greatest Story Never Told
The Return
Ultimatum
Dark Heart
Wake the Dead
The Once and Future Thing (1): Weird Western Tales
The Once and Future Thing (2): Time, Warped