[2] He engages in a training regime organized by Dr. Shay Veritas, Superman's scientific consultant, so that he can increase his power in case Helspont returns.
After a few weeks of exercise in the Block, Dr. Veritas's scientific complex, Superman returns to Metropolis so that he can resume his life as Clark Kent.
Realizing that Morgan Edge is manipulating the articles in order to increase his power and influence over Metropolis' media output, Clark quits the Daily Planet.
Needing some time to think, Supergirl wants to speak with her cousin first, so H'El gives her the ability to understand human language and transports her to Metropolis.
H'El expresses his plan to save Krypton and shows Superman the unconscious body of his clone, Superboy.
After defeating Superman, H'El leaves Metropolis, but not before stating that he will save Krypton with Kara's help, no matter what price Earth has to pay.
Luthor, who is mildly disfigured from a previous attack by Superman, reveals that H'El wants to travel back in time to prevent Krypton's destruction.
H'El sends security robots against the League while Superboy and Batman arrive to the hangar bay, where the shard is located.
H'El activates an alien prison that uses teleportation beams to trap its target into perpetual parallel dimensions.
Superman attempts to reason with Supergirl, but H'El moves the Fortress away from the Justice League and activates his machine.
[13] Wonder Woman continues fighting Supergirl, restraining her with her lasso and forcing her to see that H'El's plan will destroy Earth.
H'El does not care for Earth and forces Supergirl to choose between returning to Krypton and helping the Justice League.
As H'El disappears in the time portal he created, Supergirl falls ill from the Kryptonite poisoning and Superman takes her to the Fortress to heal her injuries.
Written by Lobdell, the story arc begins in Action Comics Annual #2 and continues through the November issues Superboy #25, Supergirl #25, Superman #25.
Krypton Returns was also linked into Lobdell's run in Teen Titans and Superman #23.3, which featured H'El in the Forever Evil event.
H'El's mind manifests through the astral plane and he sees Jor-El talking with his friend, a young soldier named Zod, about his plans to evacuate Krypton's population to a planet where its sun's radiation could give them special powers.
To do that, Jor-El wants to send an uncrewed spacecraft named "House of El", equipped with genetic material collected from all of Krypton's history.
H'El realizes he was in fact created from the genetic material in the ship and wakes up from his coma, killing Jor-El and Zod.
Supergirl travels to the age of the Great War to stop the clone rebellion from causing damage to Krypton.
[18] After getting to Argo City, Superboy meets Kara but they are attacked by the Eradicator, who wants to make sure every Kryptonian dies while Krypton explodes.
[19] Supergirl fights H'El in the Great War while Superboy continues protecting Kara in Argo City.
Supergirl returns to the present while Superboy uses his powers to save Argo City just when Krypton explodes, sacrificing his life.
Superman and Supergirl return to Earth but in a small instant, Krypton is brought back to life in the present, right before it disappears.