Superman #166

In "The Fantastic Story of Superman's Sons! Part I: Jor-El II and Kal-El II!", Superman faces a rare challenge when only one of his two sons, Kal-El II, inherits his powers—leaving Jor-El II without any super abilities. Determined to help his younger son, Superman attempts to grant him powers, but the effort ends in failure. With a heart full of hope and a mind full of purpose, he makes the bold decision to take both boys on a journey to Kandor, where the future of their destinies might finally be revealed.

In "[The Fantastic Story of Superman's Sons!] Part III: Kal-El II's Mission to Krypton!", Kal-El II and Jor-El II embark on a daring journey to Krypton to rescue Superman, facing the lingering shadows of their planet’s past. With the Phantom Zone’s imprisoned villains watching from the void and ancient statues of long-dead Kryptonians standing silent in the ruins, the fate of Earth’s mightiest hero hangs in the balance.