Comic Title: World's Finest Comics #206
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: Oct/Nov 1971
On Sale Date: August 5, 1971 Newsstand Date August 5, 1971
Source: House Ad, Sugar and Spike #98, Page 6

Copyright Date August 5, 1971
Source: Library of Congress, Periodicals 1971

Frequency: Monthly, (with the exception of Jan., Apr., and July)
Cover Price: $0.35
Page Count: 64
Editor: E. Nelson Bridwell

See Also: The Guide to DC Giants

Title: "The Secret of the Captive Caveman"
Pages: 15

Feature(s):
Superman (of Earth-1)
Batman (of Earth-1)

Writer: Bill Finger
Artist: Jim Mooney

Reprinted From:
World's Finest Comics #138 (1963)

Feature Character(s)

• Superman (last appearance in Justice League of America #24; next appearance in Action Comics #307)
• Batman (last appearance in Justice League of America #24; next appearance in Detective Comics #322)

Supporting Character(s)

• Robin (last appearance in Batman #160; next appearance in Detective Comics #322)
• Carter Nichols (last appearance in World's Finest Comics #135; next appearance in Super Friends #10)

Villain(s)

• General Grote and a group of alien rebels (no further appearances)

Other Character(s)

• A tribe of cavemen (no further appearances)

Synopsis:
Batman and Robin encounter a group of aliens who claim that the Earth is doomed, then disappear into the past. Using Professor Nichols’s time machine Batman, Robin, and Superman travel to the days of prehistoric cavemen to learn the alien secret.

They discover that the aliens are capturing cavemen using mind-controlling z-beams. The heroes allow themselves to be captured, though the z-beams have no effect on their modern minds. They are put to work as slaves on an alien world mining raw drakkium. Superman loses his powers, due to the planet’s red sun, but the heroes still manage to defeat the alien plot, turning them over to the authorities and saving Earth from an invasion.