Comic Title: Challengers of the Unknown #53
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Dec/Jan 1966
On Sale Date: October 4, 1966 Newsstand Date October 4, 1966
Source: House Ad, Adventures of Bob Hope #102, Page 20

Newsstand Date October 4, 1966
Source: Direct Currents, Adventures of Bob Hope #102

Copyright Date October 4, 1966
Source: Library of Congress, Periodicals 1966

Frequency: Bi-monthly
Cover Price: $0.12
Page Count: 32
Editor: Murray Boltinoff

Title: "Who Is the Traitor Among Us"
Pages: 24

Feature(s):
Challengers of the Unknown (of Earth-1)

Writer: France E. Herron
Artist: Bob Brown

Feature Character(s)

• Challengers of the Unknown (last appearance in Challengers of the Unknown #52; next appearance in Challengers of the Unknown #54)
• Ace Morgan (last appearance in Challengers of the Unknown #52; next appearance in Challengers of the Unknown #54)
• Rocky Davis (last appearance in Challengers of the Unknown #52; next appearance in Challengers of the Unknown #54)
• Red Ryan (last appearance in Challengers of the Unknown #52; next appearance in Challengers of the Unknown #54)
• Prof. Haley (last appearance in Challengers of the Unknown #52; next appearance in Challengers of the Unknown #54)

Villain(s)

• Dimension-Man (no further appearances)
• Iron Dictactor (believes he is Adolf Hitler; no further appearances)
• A group of storm troopers (no further appearances)

Other Character(s)

• Scientist X (in flashback; no further appearances)

Comments:
The Challengers find a new headquarters in this story.

Synopsis:
The Challengers receive a mental summons to the laboratory of Scientist X. The lab has been ransacked, but a film reveals that the scientist has intended for the Challengers to take possession of various advanced weapons. A villain known as Dimension-Man has already stolen a device which allows him to pass through dimensions and become invisible. D-Man is partnered with a Nazi known as the Iron Dictator.

The Challs try to decipher clues to the location of the other weapons. Dimension-Man lets the Challengers work on it because he wants to find the location himself. He uses the Iron Dictator to distract the Challs, while he conducts his own search.

D-Man also tries to make the Challs think one of them is a traitor. Prof creates a mind prober machine to discover who the traitor is. Fearing his plan will be revealed, D-Man strikes. However, Prof's machine is a fake. He suspected that there was no traitor and used the machine to lure D-Man into action. They defeat the Iron Dictator's storm troopers, then discover the underwater lab of Scientist X. The Challs decide to make the base their new headquarters.