The Mighty Annihilator! (Superman vs the Annihilator, with Perry White / written by Leo Dorfman) -- 2. The Death of Luthor! (Supergirl vs Lex Luthor / written by Jerry Siegel : reprinted from Action Comics #286) "Who is the only man Superman fears?"Superman (thought): There he is... switching into his secret identity. I must leave Earth before he carries out his threat to kill me!