Comic Title: Superman #234
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: February 1971
On Sale Date: December 15, 1970 Newsstand Date December 15, 1970
Source: Direct Currents, Aquaman #56, Page 29

Copyright Date December 15, 1970
Source: Library of Congress, Periodicals 1971

Frequency: Monthly, (semi-monthly June, Dec.,)
Cover Price: $0.15
Page Count: 32
Editor: Julius Schwartz

Title: "Prison in the Sky"
Pages: 7

Feature(s):
World of Krypton

Writer: E. Nelson Bridwell
Artist: Curt Swan

Feature Character(s)

• Jor-El (last appearance in Superman #123; next appearance in Superman #246)

Supporting Character(s)

• Lara (last appearance in Superman #123; next appearance in Superman #246)

Villain(s)

• Tron-Et (a newly elected member of the Science Council; no further appearances)
• Nali-Ilv and Ed-Ilv (a Kryptonian criminal and his twin brother; no further appearances)

Other Character(s)

• Jax-Ur (earliest chronological appearance; next appearance in Action Comics #336)
• Ken-Dal (last appearance in Superman #233; no further appearances)
• Unnamed science council members (no further appearances)

Comments:
This story takes place on Krypton in the Kryptonian years 9995 and 9996.

This story is retold on pages 15-20 of World of Krypton #1.

Synopsis:
Ken-Dal and Tron-Et compete for a chance to join the Science Council on Krypton. Tron-Et wins the election and immediately proposes execution for criminals to help solve the problem of prison overcrowding. Opposed to the death penalty, Jor-El devises an alternatively by sending criminals into orbit while in suspended animation.

Nali-Ilv is the first criminal sent into space. When the rocket lands 73 days later, he is brought back to Krypton. Instead of being rehabilitated, Ilv gains super powers and returns to his criminal ways. Embarrassed by his apparent folly, Jor-El discovers that Ilv's rocket was replaced with a fake. Ilv himself was killed and replaced by his twin brother who used technology to fake his powers.

Exposed, Ed-Ilv points out that Tron-Et is the head of a criminal organization and wanted the death penalty for criminals to prevent them from revealing his involvement in crime. Tron-Et is deposed and sent into orbit as punishment for his crimes.