Comic Title: Adventure Comics #240
Publisher: DC (National Comics Publications, Inc.)
Address: 480 Lexington Avenue, New York, NY
Cover Date: September 1957
Approx. On Sale Date: July 30, 1957 Copyright Date July 28, 1957
Source: Library of Congress, Periodicals 1957
Until 1958 DC did not report actual on sale dates to the copyright office
The publication dates listed in LoC records are NOT release dates.

Frequency: Monthly
Cover Price: $0.10
Page Count: 32
Editor: Mort Weisinger

Title: "The Super-Teacher from Krypton"
Pages: 12

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

Writer: Edmond Hamilton
Artist: John Sikela

Reprinted In:
Superman Annual #5 (1962)
DC Super Stars #12 (1977)

Feature Character(s)

• Superboy (last appearance in Action Comics #232; next appearance in Superboy #60)

Supporting Character(s)

• Jonathan Kent (last appearance in Superboy #59; next appearance in Adventure Comics #241)
• Martha Kent (last appearance in Superboy #59; next appearance in Superboy #60)
• Lana Lang (last appearance in Superboy #59; next appearance in Superboy #60)

Other Character(s)

• A Kryptonian teacher robot (first appearance; last appearance in New Adventures of Superboy #17; next appearance in DC Super Stars #12)
• Various Smallville residents (no further appearances)

Cameo Appearance(s)

• Jor-El (in flashback to Krypton’s destruction)
• Lara (in flashback to Krypton’s destruction)

Synopsis:
A Kryptonian teacher robot designed by Jor-El arrives on Earth and forces Superboy to perform tests of his super powers. Should Superboy fail the tests, the teacher tells him he must end his career as the Boy of Steel. Superboy finishes the tests, and the robot informs him that he did not pass. He agrees to quit using his powers, but it was only another test by the robot to see if he would voluntarily give up his Superboy identity for the greater good. Having passed all the tests, Superboy is allowed to continue, and the robot leaves Earth.