Comic Title: Challengers of the Unknown #54
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Feb/Mar 1967
On Sale Date: December 1, 1966 Newsstand Date December 1, 1966
Source: Direct Currents, Action Comics #345, Page 16

Copyright Date December 1, 1966
Source: Library of Congress, Periodicals 1966

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

Title: "War of the Sub-Humans"
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 #53; next appearance in Challengers of the Unknown #55)
• Ace Morgan (last appearance in Challengers of the Unknown #53; next appearance in Challengers of the Unknown #55)
• Rocky Davis (last appearance in Challengers of the Unknown #53; next appearance in Challengers of the Unknown #55)
• Red Ryan (last appearance in Challengers of the Unknown #53; next appearance in Challengers of the Unknown #55)
• Prof. Haley (last appearance in Challengers of the Unknown #53; next appearance in Challengers of the Unknown #55)

Villain(s)

• Villo (last appearance in Challengers of the Unknown #52; next appearance in Challengers of the Unknown #55)
• Brainex (last appearance in Challengers of the Unknown #52; next appearance in Challengers of the Unknown #55)
• Bubble-Master (no further appearances)
• The Sub-Humans (no further appearances)

Synopsis:
Brainex creates a new menace by summoning Sub-Humans from the Calculus Dimension to attack the Challengers. Fearing that the attack will kill the Challs, a task he wants to do personally, Villo forces Brainex to recall the Sub-Humans.

After the attack an amateur super-villain, Bubble-Master, approaches Villo to become a henchmen. Villo makes Bubble-Master prove himself against the Challs. When Bubble-Master proves formidible, Villo double-crosses his ally. However, Brainex crosses Villo, leaving him for the Challengers to capture.

Despite being double-crossed, Bubble-Master rescues his mentor. Brainex sends the Sub-Humans against the Challs again, but the team finds a way to defeat them. Brainex and Villo then renew their partnership.