|Bio: When Amazo returned to earth in a hunt for Amazo, Luthor was
aided by Ray Palmer, a.k.a., The Atom in finishing his laser
cannon that would hopefully disable Amazo. Though they were
unsuccessful, The Atom proved not only his extensive knowledge,
but also a general caring for Lex Luthor's life.
The Atom later returned to aid the Justice League in destroying
a "Dark Heart"--a self-replicating machine that the League
couldn't stop. The Atom infiltrated the main "heart" and
essentially gave it a heart attack--blocking one of the tubes
pumping liquid into it.