Comic Title: Challengers of the Unknown #67
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: Apr/May 1969
On Sale Date: February 4, 1969 Newsstand Date February 4, 1969
Source: House Ad, Superman #215, Page 20

Copyright Date February 4, 1969
Source: Library of Congress, Periodicals 1969

Newsstand Date February 4, 1969
Source: Comic Reader, #71

Frequency: Bi-monthly
Cover Price: $0.12
Page Count: 32
Circulation: 166836
Editor: Murray Boltinoff

Title: "Ace:The Beast in the Bomb"
Pages: 10

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 #67; next appearance in Challengers of the Unknown #68)
• Ace Morgan (last appearance in Challengers of the Unknown #67; next appearance in Challengers of the Unknown #68)
• Red Ryan (last appearance in Challengers of the Unknown #67; next appearance in Challengers of the Unknown #68)
• Rocky Davis (last appearance in Challengers of the Unknown #67; next appearance in Challengers of the Unknown #68)
• Prof. Haley (last appearance in Challengers of the Unknown #67; next appearance in Challengers of the Unknown #68)

Villain(s)

• A mad scientist (no further appearances)

Other Character(s)

• Doc Stevens (no further appearances)

Synopsis:
The Challengers track a renegade scientist to an underground labyrinth of caverns. When they split up to search Ace is knocked out and a bomb is attached to his head. The other Challengers rush him back to the city only to discover that the bomb is linked to his heart. Ace is placed into an ice bath and his heart stops. The bomb is safely removed, and Ace is revived. The Challengers then return to the caverns with the bomb. The scientist accidentally triggers it, killing himself, but the Challengers aren't harmed.