|Bio: The Justice League faced one of
their most formidable adversary's yet--a machine made out of
nano-technology that was able to replicate itself. The central
"heart" sent out millions of drones; each time one was
destroyed, depending on the "piece" amount, it would form
another two, three or four.
The Dark Heart originated from a warring planet that sent it at
it's rival like a cruise-missile. The heart landed on the
planets surface and slowly destroyed the entire planet.
Replicating itself each time it landed on a planet, the dark
heart took over planet after planet for over fifty-thousand
years, not knowing the war was over.
The Justice League, aided by Ray Palmer
(The Atom), destroyed the one that landed in the U.S. But there
are undoubtedly more out in the galaxy, still wreaking havoc and
destroying the planets inhabitants.
The army took the remaining pieces of the Dark Heart away. The Dark
Heart later found its way to Cadmus, who stored it after not being able
to understand how it worked. Lex Luthor and Brainiac later stole it from
Cadmus and nearly succeeded in destroying the world.