Comic Title: Challengers of the Unknown #65
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Dec/Jan 1968
On Sale Date: October 1, 1968 Copyright Date October 1, 1968
Source: Library of Congress, Periodicals 1968

Newsstand Date September 1, 1968
Source: Comic Reader, #69
Likely intended to be 10/1 but misprinted 9/1

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

Title: "The Devil's Circus"
Pages: 12

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

Writer: Robert Kanigher
Artist: Jack Sparling

Feature Character(s)

• Challengers of the Unknown (last appearance in Challengers of the Unknown #64; next appearance in Challengers of the Unknown #66)
• Ace Morgan (last appearance in Challengers of the Unknown #64; next appearance in Challengers of the Unknown #66)
• Red Ryan (last appearance in Challengers of the Unknown #64; next appearance in Challengers of the Unknown #66)
• Rocky Davis (last appearance in Challengers of the Unknown #64; next appearance in Challengers of the Unknown #66)
• Prof. Haley (last appearance in Challengers of the Unknown #64; next appearance in Challengers of the Unknown #66)

Villain(s)

• Dread (a giant alien; no further appearances)

Other Character(s)

• A mental patient (no further appearances)

Synopsis:
The Challengers receive a cryptic message from a mental patient that was found wandering the highway. The message leads them to Cobra Canyon where a giant alien awaits. The alien from the planet of Dread captures the Challs and forces them to battle insect creatures in an alien circus. The team members survive their battles, then lead the alien into a pit of quicksand.