Superman #144

In "The Super-Weapon!", Lex Luthor's latest scheme takes a dangerous turn when he arms Bert Talbot with Weapon-X—a device designed to drain Superman's powers and turn them into a weapon capable of destroying the Man of Steel. With Luthor imprisoned and Talbot given the means to strike, the line between prisoner and predator blurs as Talbot's ambitions grow far beyond his original mission.

In the quiet isolation of his Fortress of Solitude, Superman examines a mysterious machine pulled from the void—only for it to detonate, unraveling Earth’s very existence. With the planet gone and only Superman, Supergirl, and Krypto left, the Interstellar Council of United Planets [Zog] must decide what comes next for the last remnants of humanity.