"Kryptonite is gone, but the Man of Steel's troubles have just begun in this collection of pivotal Superman stories from the 1970s. ... Everyone knows Superman's major weakness: Kryptonite. But what happens when that's taken off the board, as a scientific experiment turns all the kryptonite on Earth to iron? Originally published in 1971, 'Kryptonite nevermore' turned the Man of Steel's status quo on its head, as his powers slowly begin to fade and a doppelgèanger Superman arrives on the scene with strange powers of its own--and any contact between the two might result in the destruction of the planet. [This book] includes further Bronze Age adventures by comics legends including Dennis O'Neil, Curt Swan, Cary Bates, and Len Wein"--Provided by publisher.

Dennis O'Neil began his career as a comic book writer in 1965 at Charlton, where then-editor Dick Giordano assigned him to several features. When Giordano moved to DC, O'Neil soon followed. At DC, O'Neil scripted several series for Giordano and Julius Schwartz, quickly becoming one of the most respected writers in comics. O'Neil earned a reputation for being able to "revamp" such characters as Superman, Green Lantern, Captain Marvel and Batman, whom O'Neil (with the help of Neal Adams and Giordano) brought back to his roots as a dark, mysterious, gothic avenger. Besides being the most important Batman writer of the 1970s, O'Neil served as an editor at both Marvel and DC. After a long tenure as group editor of the Batman line of titles, he retired to write full-time. O’Neil passed away in 2020.