Issue: #233
Last valuation update: 2025-11-21
A scientific experiment turns all the kryptonite on Earth to iron, as Clark Kent moves from newspaper to television journalism. "Superman Breaks Loose" written by Denny O'Neil, penciled by Curt Swan and inked by Murphy Anderson. Superman helps with a Kryptonite-powered generator test, but something goes wrong and there's a massive explosion. But the explosion's side effect transforms all Krypto...
First appearances: Sand Creature, Waz-Em, Fal-Thu, Professor Bolden
Creators: Dennis O'Neil, Julius Schwartz, Neal Adams, Curt Swan, Murphy Anderson, Henry Boltinoff, E. Nelson Bridwell
Characters: Superman, Lois Lane, Jimmy Olsen, Perry White, General Zod, Jax-Ur, Morgan Edge, Sand Creature, Ken-Dal, Waz-Em, Fal-Thu, Professor Bolden, Kim-Da, Super-Turtle, Jor-El, Lara Lor-Van