Lex Luthor designs Weapon-X, a device that can drain Superman's powers and use them to power a weapon powerful enough to destroy Superman. Bert Talbot is supposed to use the weapon to help spring Luthor from prison but instead decides to try to use the weapon to destroy Superman himself.; The story of Superboy's debut and first meeting with President Roosevelt.; In his Fortress of Solitude, Superman disassembles a strange machine he found in space. When the machine explodes and destroys the Earth, Superman, Supergirl and Krypto are the only survivors.