Comic Title: Challengers of the Unknown #18
Publisher: DC (National Comics Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Feb/Mar 1961
On Sale Date: December 13, 1960 Newsstand Date December 13, 1960
Source: House Ad, Blackhawk #157, Page 20

Copyright Date December 13, 1960
Source: Library of Congress, Periodicals 1960

Newsstand Date December 13, 1960
Source: Newsdealer Magazine, V15 #10

Frequency: Bi-monthly
Cover Price: $0.10
Page Count: 32
Circulation: 228000
Editor: Jack Schiff

Title: "The Doomed World of Tomorrow"
Pages: 12

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

Artist: Bob Brown

Reprinted In:
Showcase Presents:Challengers of the Unknown Vol. 2 TPB (2008)

Feature Character(s)

• Challengers of the Unknown (last appearance in Challengers of the Unknown #18; next appearance in Challengers of the Unknown #19)
• Ace Morgan (last appearance in Challengers of the Unknown #18; next appearance in Challengers of the Unknown #19)
• Rocky Davis (last appearance in Challengers of the Unknown #18; next appearance in Challengers of the Unknown #19)
• Red Ryan (last appearance in Challengers of the Unknown #18; next appearance in Challengers of the Unknown #19)
• Prof. Haley (last appearance in Challengers of the Unknown #18; next appearance in Challengers of the Unknown #19)

Villain(s)

• Several cosmic creatures (no further appearances)
• Lenroy (a scientist; no further appearances)

Other Character(s)

• Dr. Oren Gough (a 23rd century scientist; no further appearances)

Synopsis:
The Challengers are transported to the 23rd century in an experimental time machine by Dr. Oren Gough. Gough is trying to stop several cosmic creatures which threaten the population. The people plan to use a weapon called the Volti-gun against the creatures, but must evacuate because the gun has side-effects dangerous to humans.

The Challs agree to help defeat the cosmic creatures, but another sceintist, Lenroy, objects. He and his robots try to kill the Challs to protect his secret. Lenroy has perfected the Volti-gun and removed its side effects. He planned to stop the creatures and become a hero to his people. In doing so he would gain power over the population. The Challs expose Lenroy’s plan and stop the creatures using the new Volti-guns. Gough then returns them to their own time.