Comic Title: Challengers of the Unknown #50
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Jun/Jul 1966
On Sale Date: April 7, 1966 Newsstand Date April 7, 1966
Source: House Ad, Showcase #62, Page 21

Copyright Date April 7, 1966
Source: Library of Congress, Periodicals 1966

Newsstand Date April 7, 1966
Source: Newsdealer Magazine, V21 #2

Frequency: Bi-monthly
Cover Price: $0.12
Page Count: 32
Editor: Murray Boltinoff

Title: "Final Hour for the Challengers"
Pages: 24

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

Writer: France E. Herron
Artist: Bob Brown

Feature Character(s)

• Challengers of the Unknown (last appearance in Challengers of the Unknown #49; next appearance in Challengers of the Unknown #51)
• Ace Morgan (last appearance in Challengers of the Unknown #49; next appearance in Challengers of the Unknown #51)
• Rocky Davis (last appearance in Challengers of the Unknown #49; next appearance in Challengers of the Unknown #51)
• Red Ryan (last appearance in Challengers of the Unknown #49; next appearance in Challengers of the Unknown #51)
• Prof. Haley (last appearance in Challengers of the Unknown #49; next appearance in Challengers of the Unknown #51)

Villain(s)

• Villo (next appearance in Challengers of the Unknown #52)
• Brainex (next appearance in Challengers of the Unknown #52)
• Four mobsters (no further appearances)

Comments:
Challenger Mountain is destroyed in this story.

Synopsis:
The Challengers are lured to a mob-controlled amusement park. The mobsters have hired Villo, the self-proclaimed vilest villain in the world, to eliminate them. Villo plans to use one of the Challengers own members to kill the others. He captures all of them except Rocky, then rigs their cells to explode. When Rocky attempts to rescue Ace, the bomb should go off, but instead a chemical reaction turns Ace into a giant monster.

Villo retreats and regroups with his partner Brainex, a thinking computer. They capture Ace and brainwash him, then send him against the other Challs. He attacks them at Challenger Mountain, where he causes an explosion. The Challs escape safely, though their headquarters is destroyed.

The Challs track down Villo at his mobile headquarters. All of them except Prof are captured. Prof disables Brainex, then changes Ace back to normal. He frees the other Challengers, but Villo and Brainex escape.