All Star Adventure Comic #87

In "The War Between Krypton and the Earth (Part I)," the Legionnaires split their mission across time: one team arrives in ancient Atlantis, where they witness alien settlers establishing a hidden colony beneath the waves, while the other follows a group of Kryptonians fleeing a rigid, anti-scientific society to begin a new life on Earth. The story unfolds with a sense of mystery and wonder, as the past reveals echoes of a forgotten conflict that may have shaped both worlds.

In "The Civil War of the Legion (Part II)," the escalating conflict between the Atlanteans and Kryptonians reaches a critical turning point when Brainiac 5 uncovers the root of the Atlanteans' discomfort with Earth's atmosphere—and devises a way to help them adapt to life beneath the waves. Meanwhile, back in the future, Superboy continues his search through ancient relics, unearthing new clues that deepen the mystery of the Kryptonians' fate.