Comic Title: Challengers of the Unknown #19
Publisher: DC (National Comics Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Apr/May 1961
On Sale Date: February 14, 1961 Newsstand Date February 14, 1961
Source: House Ad, My Greatest Adventure #54, Page 20

Copyright Date February 14, 1961
Source: Library of Congress, Periodicals 1961

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

Title: "The Alien Who Stole a Planet"
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 #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)

• Bara and three henchmen (aliens; no further appearances)

Other Character(s)

• Ia and Lyo (aliens from a distant world; no further appearances)

Synopsis:
A doomed world in another galaxy uses a special machine to transfer its inhabitants to special reels of tape so they can escape their world. Three alien beings are left to guard the tapes on their journey. The ship crashes on Earth and two of the aliens seek materials to repair it.

The Challengers meet the two aliens and agree to help locate the necessary materials, but the third member of the expedition, Bara, decides to place himself in control of the world. Bara captures one of the aliens as well as converting Red and Prof to reels of tape.

The other alien, Ia, and the other Challs escape, only to return and capture Bara’s henchmen. They then track down Bara who threatens a city with another weapon. They defeat him and rescue their comrades, restoring them to normal. Ia and his companion, Lyo, place Bara in custody and continue on their journey to a new world.