Supergirl, Green Arrow, and The Question investigate Supergirl's disturbing dreams. They discover that Cadmus created a clone of Supergirl named Galatea while she was recovering from her fight against Superman on Earth.

A team of too-good-to-be-true superheroes find out the truth about their origins and go on the rampage.

Superman battles Doomsday in the heart of a volcano. Doomsday is revealed to be a modified clone of Superman. Batman probes the Cadmus conspiracy to destroy the Justice League.

Captain Marvel joins the Justice League and his innocent presence inadvertently causes friction with Superman.

The Question, fearing disaster, decides to kill Lex Luthor to avert it.

While the senior Leaguers struggle to respond to the mysterious main gun firing, Amanda Waller orders Galatea to lead a full attack on the Justice League.