Comic Title: Challengers of the Unknown #43
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Apr/May 1965
On Sale Date: February 4, 1965 Copyright Date February 4, 1965
Source: Library of Congress, Periodicals 1965

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

Title: "Four Against Monstro"
Pages: 12

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 #42; next appearance in Challengers of the Unknown #44)
• Ace Morgan (last appearance in Challengers of the Unknown #42; next appearance in Challengers of the Unknown #44)
• Rocky Davis (last appearance in Challengers of the Unknown #42; next appearance in Challengers of the Unknown #44)
• Red Ryan (last appearance in Challengers of the Unknown #42; next appearance in Challengers of the Unknown #44)
• Prof. Haley (last appearance in Challengers of the Unknown #42; next appearance in Challengers of the Unknown #44)

Villain(s)

• Monstro (no further appearances)

Other Character(s)

• Two scientists from 2265 (no further appearances)

Synopsis:
The Challengers are brought to the future year of 2265. Scientists ask for help to defeat Monstro, a giant being that is destroying their cities. Monstro hatched inside the Earth in 1965, so the scientists want the Challs to stop his creation.

The Challs return to their own time. However, their efforts to prevent Monstro's creation fail. Prof makes an observation about Monstro's behavior and deduces his weakness. The Challs then return to the future and use ordinary water to defeat Monstro.