Action Comics #572

In "SOS from Nowhere!", Superman answers a desperate distress call from a dying alien species—two surviving members of an extinct feline race hunted to near extinction. After rescuing them and bringing them to safety in his Fortress of Solitude, their descendants arrive to honor him with their highest tribute for saving their people’s legacy.

In "The Puzzle of the Purloined Fortress!", Superman welcomes Jon, the son of Pete Ross, to his Fortress of Solitude—only to discover that his alien weapons have vanished. With Jon’s sharp instincts and a hint of curiosity, the duo sets out to solve the mystery of the missing arsenal, unraveling clues hidden within the high-tech sanctuary.