Comic Title: Challengers of the Unknown #40
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Oct/Nov 1964
On Sale Date: August 6, 1964 Copyright Date August 6, 1964
Source: Library of Congress, Periodicals 1964

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

Title: "The Spy in Challenger Cave"
Pages: 12

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

Writer: Arnold Drake
Artist: Bob Brown

Feature Character(s)

• Challengers of the Unknown (last appearance in Challengers of the Unknown #40; next appearance in Challengers of the Unknown #41)
• Ace Morgan (last appearance in Challengers of the Unknown #40; next appearance in Challengers of the Unknown #41)
• Rocky Davis (last appearance in Challengers of the Unknown #40; next appearance in Challengers of the Unknown #41)
• Red Ryan (last appearance in Challengers of the Unknown #40; next appearance in Challengers of the Unknown #41)
• Prof. Haley (last appearance in Challengers of the Unknown #40; next appearance in Challengers of the Unknown #41)

Villain(s)

• Multi-Man (disguised as Mr. Voodoo; last appearance in Challengers of the Unknown #34; next appearance in Challengers of the Unknown #42)

Comments:
This story includes a diagram of Challengers Mountain.

Synopsis:
Disguised as Mr. Voodoo, Multi-Man lures the Challengers into a chase. He then sends a robotic spy back to Challengers Mountain with the team. The spy gets details containing the layout of the secret mountain complex, but not the exact location. Multi-Man uses the info to infiltrate the mountain, after he squares off against the Challengers again. Multi-Man captures the Challs in a sticky web, but Prof uses a trick, which allows him time to escape. Multi-Man is then captured and returned to the authorities.