Comic Title: Aquaman #9
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: May/Jun 1963
On Sale Date: March 21, 1963 Copyright Date March 21, 1963
Source: Library of Congress, Periodicals 1963

Frequency: Bi-monthly
Cover Price: $0.12
Page Count: 32
Editor: George Kashdan

Title: "The Secret Mission of King Neptune"
Pages: 25

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

Artist: Nicholas Peter Cardy

Reprinted In:
Showcase Presents Aquaman Vol. 2 TPB (2008)

Feature Character(s)

• Aquaman (last appearance in Justice League of America #19; next appearance in Justice League of America #20)

Supporting Character(s)

• Aqualad (last appearance in World's Finest Comics #133; next appearance in Aquaman #10)

Other Character(s)

• Captain Crane (transformed into Neptune; no further appearances)
• Various seamen and military officials (no further appearances)
• Neptune (an ancient sorcerer; no further appearances)

Comments:
Chap. 2: "The Menace of the Aqualad-Creature"
Chap. 3: "The End of Aqualad"

Synopsis:
Aquaman’s friend Captain Crane has discovered a map leading to the mythological kingdom of Neptune. Aquaman, Aqualad, and the captain locate the entrance, but when Crane enters he is transformed into Neptune himself. He then begins menacing shipping lanes and even transforms Aqualad into a crab-creature. Aquaman eventually discovers that the real Neptune was an ancient sorcerer, who left devices to be found by a future person in order to prevent a volcanic catastrophe. Aquaman then clears the way for Crane to prevent the disaster. When his mission has been completed Crane and Aqualad revert to normal.