Black Zero appears in 7 issues.
Member of the Challengers of the Unknown.
One of the most notorious of Hell's demons, Etrigan's soul was merged with the body of a human man, Jason Blood, who calls upon the demon's terrifying power to fight the forces of darkness.
Honorary member of the Challengers of the Unknown
Knockout was a former Female Fury from Apokolips. As such she possesses the strength and ferocity of those hazed through the fires of her world.
Superboy's origins start with Project: Man of Tomorrow, which is the Superman cloning project originally intended to recreate the Man of Steel.
Walter "Prof" Haley is the leader of the Challengers of the Unknown team.
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