Comic Title: Superman from the Thirties to the Seventies HC
Publisher: Crown/Harmony (Bonanza Books)
Address: One Park Avenue, New York, NY
Cover Date: 1971
On Sale Date: December 14, 1971 Copyright Date December 14, 1971
Source: Library of Congress, Pamphlets 1972

Cover Price: $12.95
Page Count: 388

Title: "Superman Breaks Loose"
Pages: 15

Feature(s):
Superman (of Earth-1)

Writer: Dennis J. O'Neil
Penciller: Curt Swan
Inker: Murphy Anderson

Reprinted From:
Superman #233 (1971)

Feature Character(s)

• Superman (last appearance in Aquaman #55; next appearance in Superman's Girl Friend Lois Lane #107)

Supporting Character(s)

• Lois Lane (last appearance in Action Comics #395; next appearance in Superman's Girl Friend Lois Lane #107)
• Jimmy Olsen (last appearance in World's Finest Comics #199; next appearance in Forever People #1)
• Perry White (last appearance in World's Finest Comics #199; next appearance in Superman's Girl Friend Lois Lane #107)

Villain(s)

• Morgan Edge's clone (last appearance in Superman's Pal Jimmy Olsen #134; next appearance in Superman #234)
• A criminal gang (no further appearances)
• The sand Superman (first appearance; next appearance in Superman #234)

Other Character(s)

• Professor Bolden and his assistants (no further appearances)

Comments:
All Kryptonite on Earth is converted to iron in this story.

Superman experiences a temporary power loss in this story which is attributed to the Kryptonite experiment. This power loss symptom is repeated in several subsequent stories.

The Morgan Edge who appears in this story is really a clone. The real Morgan Edge first appears in Superman #241.

Synopsis:
An experiment by Professor Bolden to use Kryptonite as a power source results in failure. Superman is standing by with a lead shield, but he is unable to stop the energy unit from exploding. Superman is knocked unconscious. Moments later he revives. The scientists then bring forward a startling discovery, all the Kryptonite used in the experiment has been changed into ordinary iron which is harmless to Superman. Even Kryptonite stored some distance from the reactor has been converted to iron. Within hours, it is discovered that virtually no Kryptonite remains on Earth.

Superman returns to the Daily Planet for his job as Clark Kent. The new owner of the Daily Planet, Morgan Edge, orders Kent to cover the launch of a new mail rocket. Although, Clark is a newspaperman, not a television reporter, he handles the assignment. During timed commercial breaks he goes into action as Superman to thwart a criminal plot. Edge is impressed with Kent's results and makes television Clark's new assignment.

Meanwhile back at the site of the Kryptonite experiment, a being arises from the sand where Superman fell. It resembles Superman.