Comic Title: Challengers of the Unknown #8
Publisher: DC (National Comics Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Jun/Jul 1959
On Sale Date: April 14, 1959 Copyright Date April 14, 1959
Source: Library of Congress, Periodicals 1959

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

Title: "The Prisoners of Robot Planet"
Pages: 13

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

Writer/Penciller: Jack Kirby
Inker: Wallace Wood

Reprinted In:
Challengers of the Unknown Archives Vol. 2 HC (2004)
Showcase Presents Challengers of the Unknown Vol. 1 TPB (2006)
Challengers of the Unknown Omnibus HC (2012)
Challengers of the Unknown by Jack Kirby TPB (2018)

Feature Character(s)

• Challengers of the Unknown (last appearance in Challengers of the Unknown #8; next appearance in Challengers of the Unknown #9)
• Ace Morgan (last appearance in Challengers of the Unknown #8; next appearance in Challengers of the Unknown #9)
• Rocky Davis (last appearance in Challengers of the Unknown #8; next appearance in Challengers of the Unknown #9)
• Red Ryan (last appearance in Challengers of the Unknown #8; next appearance in Challengers of the Unknown #9)
• Prof. Haley (last appearance in Challengers of the Unknown #8; next appearance in Challengers of the Unknown #9)

Villain(s)

• Kra (next appearance in Challengers of the Unknown #42)
• The robots of the planet Zuna (no further appearances)

Other Character(s)

• Citizens of Zuna (Juhl named; no further appearances)

Synopsis:
Juhl, a citizen of the planet Zuna, requests the assistance of the Challengers. His planet has been taken over by robots. The robots have been powered by a radiation which is deadly to them. The Challs travel to Zuna to help Juhl.

An antidote that will disable the robots has been created by Juhl’s people. Unfortunately, they have no way to administer it. Rocky and Ace steal an ancient aircraft from a museum that is loaded with a supply of the antidote.

Red and Prof sneak in to the robot base and disable Kra, the robot leader. Prof takes over Kra’s body and makes him order all the robots to the city square. Once there, Ace flys overhead in the aircraft and sprays the robots with the antidote. Juhl’s people are saved, and the Challs return home.