| Issue | #233 |
| Published | January 1971 |
| Cover Price | 0.15 USD |
| Pages | 36 |
| Editing | Julius Schwartz |
| Notes | Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. [July 2007]. |
| Characters | Superman; green kryptonite |
| Synopsis | Superman breaks free of kryptonite chains |
| Genre | superhero |
| Pencils | Neal Adams |
| Inks | Neal Adams |
| Notes | Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. [July 2007]. |
| Reprinted | in Superman from the Thirties to the Seventies (Crown Publishers, Inc., 1971 series) #nn (1971); in Superman in the Seventies (DC, 2000 series) #nn [modified]; in Millennium Edition: Superman 233 (DC, 2001 series) #nn |
| Characters | Superman; Professor Bolden; Jimmy Olsen; Lois Lane; Clark Kent; Morgan Edge; Perry White; Sand creature (origin); green kryptonite |
| Synopsis | A scientific experiment turns all the kryptonite on Earth to iron, as Clark Kent moves from newspaper to television journalism. |
| Genre | superhero |
| Script | Denny O'Neil |
| Pencils | Curt Swan |
| Inks | Murphy Anderson |
| Notes | No villain. |
| Reprinted | in Action Comics (DC, 1938 series) #485 [with new framing pages]; in Superman from the Thirties to the Seventies (Crown Publishers, Inc., 1971 series) #nn (1971); in Superman in the Seventies (DC, 2000 series) #nn; in Millennium Edition: Superman 233 (DC, 2001 series) #nn; in Supermann (Williams Forlag A/S, 1969 series) #11/1971 |
| Script | Henry Boltinoff |
| Pencils | Henry Boltinoff |
| Inks | Henry Boltinoff |
| Letters | Henry Boltinoff |
| Reprinted | in Millennium Edition: Superman 233 (DC, 2001 series) #nn |
| Characters | Jor-El; Kim-Da; Professor Ken-Dal; General Dru-Zod; Lara Lor-Van; Fal-Thu; Waz-Em; Krypton |
| Synopsis | Ignoring the jeers of his colleagues, Kryptonian scientist Jor-El experiments with using anti-gravity to aid in space travel. But when astronaut Lara Lor-Van stows away in Jor-El's test rocket, the rocket crashes on Krypton's moon Wegthor, and Jor-El has to come to her rescue. |
| Genre | super-hero; science fiction |
| Script | E. Nelson Bridwell |
| Pencils | Murphy Anderson |
| Inks | Murphy Anderson |
| Notes | Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. |
| Reprinted | in Best of DC, The (DC, 1979 series) #40 (September 1983); in Millennium Edition: Superman 233 (DC, 2001 series) #nn (January 2001); in Superman: The World of Krypton (DC, 2008 series) #nn |
| Script | E. Nelson Bridwell |
| Notes | letters page |