Comic Title: Challengers of the Unknown #23
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Dec/Jan 1961
On Sale Date: October 12, 1961 Copyright Date October 12, 1961
Source: Library of Congress, Periodicals 1961

Frequency: Bi-monthly
Cover Price: $0.12
Page Count: 32
Editor: Jack Schiff

Title: "The Island in the Sky"
Pages: 13

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 #23; next appearance in Challengers of the Unknown #24)
• Ace Morgan (last appearance in Challengers of the Unknown #23; next appearance in Challengers of the Unknown #24)
• Rocky Davis (last appearance in Challengers of the Unknown #23; next appearance in Challengers of the Unknown #24)
• Red Ryan (last appearance in Challengers of the Unknown #23; next appearance in Challengers of the Unknown #24)
• Prof. Haley (last appearance in Challengers of the Unknown #23; next appearance in Challengers of the Unknown #24)

Supporting Character(s)

• June Robbins (last appearance in Challengers of the Unknown #22; next appearance in Challengers of the Unknown #24)

Villain(s)

• Zog and his gang (alien criminals; no further appearances)

Other Character(s)

• Dr. Kue and Greeg (two alien scientists; no further appearances)

Synopsis:
Baffled by strange disappearances of objects from a nearby town, the Challengers encounter two aliens. Rocky and Prof trail the aliens, while Ace, June, and Red fly into a strange cloud that has been near each event. Hidden inside the cloud is an floating platform controlled by alien criminals. Ace and his partners are captured by the aliens and imprisoned.

Meanwhile Rocky and Prof are attacked by a metallic beast. The two aliens come to the rescue and explain that they are the scientists who created the floating platform. However, it was taken over by Zog, a criminal, and his men.

Rocky and Prof stow away aboard an aircraft flown by the alien scientists to the platform. The scientists are captured by Zog, but the Challs free their captured partners. By creating a distraction, the Challs give the scientists time to use a secret device which defeats the criminals. They then return to their home planet with their prisoners.