At the end of the Revenge story in Action Comics (978-982) Zod freed Ursa and Lor from the Phantom Zone with the help of the Eradicator. All four of them then took off for space to establish a New Krypton on another world. Later Superman is obsessing over if the Jor El he met is the real Jor El and decides to travel back in time to find out. This brings in Booster Gold who sets out to stop Superman from messing up the timesteam. Superman is so obsessed with finding out the answer he fights Booster and ends up messing things up. They get thrown into the future where they land on Zod's new world he has taken over where we now see a grown Lor who is just as evil as his father. This all goes on in the Booster Shot storyline in Action Comics 994-999.
At the same time Superman is fighting the Zod family in the future the Green Lantern Corps is dealing with them in the present. Hal and Kyle end up on Zod's world and get their asses handed to them. The Gaurdians decide to get involved and send a large group of Lanterns to rescue Kyle. At the end it is a stalemate with with Gaurdians deciding to leave Lod alone as long as he stays on his own world. Zod's Will takes place in issues 37-41 of Hal Jordan and the Green Lantern Corps.