Some jokerized super evils, including Icicle
and Killer Frost unlock Eradicator who has been frozen in the absolute zero
chamber, and who takes care them in gratitude (well, not very).
Flash is the fastest man alive. The supporting
character is Pied Piper who had been Flash's regular antagonist but improved,
however now, he is suspected of murdering his parents and he does not deny the
charge.
Spectre is none other than Hal Jordan, the
second Green Lantern (The Green Lantern), who became the super evil Parallax or
at least his hosts or something like that. He currently is dead, but the spirit
of vengeance, Spectre has chosen his soul (not his body) for his hosts, and he
has decided to use the power of Spectre for not revenge, but redemption. Well
it is pretty complicated.
Harley Quinn has appeared a fewtimes on my
blog, but so far I has not much said about her background. Her character was
invented for the 1992 Batman cartoons, and she became so popular that she has
been transferred to the comics.
JSA (Justice Society of America) is the alternative JLA (Justice League
of America)
with superhero members from the Golden Age (i.e. Flash with potty on his head
and others).