Contains material originally published in single magazine form as Superboy 14-17, Superboy Annual 1, Supergirl 14-17 and Superman 13-17.

"Superman is the Last Son of Krypton. Supergirl , his cousin, is that dead world's last daughter. Superboy, his clone, bears its legacy in his DNA. But the power of Krypton fuels another being. A being more powerful than any of these three heroes. And far more mad. They call him H'el. Combining godlike strength with immeasurable mental powers, H'el claims to be a long-lost student of Superman's brilliant father Jor-El. He has come to Earth to use it's resources in a last-ditch attempt to save Krypton from its fate. And if our world must die so that his might live . . . so be it. Now Superman, Supergirl and Superboy stand divided. The time has come to decide: Which world are they truly loyal to? And what are they willing to sacrifice to save it?" -- provided by publisher.