Comic Title: Detective Comics #314
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: April 1963
On Sale Date: February 28, 1963 Newsstand Date February 28, 1963
Source: House Ad, World's Finest Comics #132, Page 30

Copyright Date February 28, 1963
Source: Library of Congress, Periodicals 1963

Frequency: Monthly
Cover Price: $0.12
Page Count: 32
Editor: Jack Schiff

Title: "J'onn J'onzz Vs. John Jones"
Pages: 12

Feature(s):
Martian Manhunter (of Earth-1)

Artist: Joe Certa

Reprinted In:
Showcase Presents:Martian Manhunter Vol. 2 TPB (2009)

Feature Character(s)

• Martian Manhunter (last appearance in Justice League of America #18; next appearance in Justice League of America #19)

Supporting Character(s)

• Captain Harding (last appearance in Detective Comics #312; next appearance in Detective Comics #315)
• Diane Meade (last appearance in Detective Comics #312; next appearance in Detective Comics #315)
• Zook (last appearance in Detective Comics #312; next appearance in Detective Comics #315)

Villain(s)

• An unnamed Saturnian criminal (no further appearances)

Other Character(s)

• Two lawmen from Saturn (no further appearances)
• Watkins (a police officer; no further appearances)
• Arne and his wife (an old couple; no further appearances)

Synopsis:
A criminal from Saturn hides out on Earth and assumes the identity of detective John Jones, while first knocking out the real detective. When lawmen from Saturn arrive on Earth, the phony detective Jones lures them into a trap.

Zook has realized that the real detective Jones has been injured and finds him. John has amnesia, but Zook helps him regain his memory. He then battles the Saturnian criminal as the Martian Manhunter and turns him over to the visiting lawmen.