Comic Title: Detective Comics #321
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: November 1963
On Sale Date: September 26, 1963 Copyright Date September 26, 1963
Source: Library of Congress, Periodicals 1963

Newsstand Date September 26, 1963
Source: Newsdealer Magazine, V18 #8

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

Title: "The Cosmic Creature"
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 #23; next appearance in Justice League of America #24)

Supporting Character(s)

• Captain Harding (last appearance in Detective Comics #320; next appearance in Detective Comics #322)
• Zook (last appearance in Detective Comics #320; next appearance in Detective Comics #322)

Villain(s)

• A cosmic creature (no further appearances)

Synopsis:
J’onn J’onzz and Zook return to their mountain hideaway to discover a space creature buried beneath the mountain has broken through and escaped. J’onn tangles with the creature which is capable of changing form. Finally, he finds a white substance which has kept the creature dormant for years. Using the substance J’onn is able to subdue the creature, which then disappears completely.