Comic Title: Challengers of the Unknown #9
Publisher: DC (National Comics Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Aug/Sep 1959
On Sale Date: June 16, 1959 Copyright Date June 16, 1959
Source: Library of Congress, Periodicals 1959

Newsstand Date June 16, 1959
Source: Newsdealer Magazine, V14 #4

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

Title: "The Plot to Destroy Earth"
Pages: 14

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

Artist: Bob Brown

Reprinted In:
Showcase Presents Challengers of the Unknown Vol. 1 TPB (2006)

Feature Character(s)

• Challengers of the Unknown (last appearance in Challengers of the Unknown #9; next appearance in Challengers of the Unknown #10)
• Ace Morgan (last appearance in Challengers of the Unknown #9; next appearance in Challengers of the Unknown #10)
• Rocky Davis (last appearance in Challengers of the Unknown #9; next appearance in Challengers of the Unknown #10)
• Red Ryan (last appearance in Challengers of the Unknown #9; next appearance in Challengers of the Unknown #10)
• Prof. Haley (last appearance in Challengers of the Unknown #9; next appearance in Challengers of the Unknown #10)

Villain(s)

• Three alien creatures and their robot controllers (no further appearances)

Other Character(s)

• Various military personnel (no further appearances)

Synopsis:
An alien ship appears in orbit and sends three creatures to Earth. The Challengers try to stop the creatures by land, sea, and air, but they fail. Ace flies into space and boards the space craft, learning the creatures are part of a plot to carve up the Earth. The ship is also indestructible, so Ace returns to Earth.

The Challengers then construct duplicates of the creatures. They program the duplicates to act like the real ones, then destroy them after several minutes. The robot controllers in the space craft watch the creatures be destroyed, then they retreat into space. Once the ship is out of orbit, the real creatures are destroyed. The Challs plan to trick the aliens is successful, and the Earth is saved.