Comic Title: World's Finest Comics #225
Publisher: DC (National Periodical Publications, Inc.)
Address: 75 Rockefeller Plaza, New York, NY
Cover Date: Sep/Oct 1974
On Sale Date: June 18, 1974 Newsstand Date June 18, 1974
Source: Comic Reader, #107

Copyright Date June 18, 1974
Source: Library of Congress, Periodicals 1974


Frequency: Bi-monthly
Cover Price: $0.60
Page Count: 96
Editor: Murray Boltinoff

See Also: The Guide to DC Giants

Title: "Prisoners of 100 Million B.C."
Pages: 24

Feature(s):
Rip Hunter (of Earth-1)

Writer: Jack Miller
Artist: Ruben Moreira

Reprinted From:
Showcase #20 (1959)

Feature Character(s)

• Rip Hunter (first appearance; last appearance in Justice League of America #144; next appearance in Showcase #21)

Supporting Character(s)

• Jeff Smith (first appearance; last appearance in Justice League of America #144; next appearance in Showcase #21)
• Bonnie Baxter (next appearance in Showcase #21)
• Corky Baxter (next appearance in Showcase #21)

Villain(s)

• Hoyt and Keegan (two small-time crooks; no further appearances)

Comments:
Chap. 2: "The Modern-Day Cavemen"
Chap. 3: "The Great Beast Stampede"

Rip Hunter invents and uses two Time Sphere which allow him and his friends to travel into the past.

Synopsis:
Rip Hunter invents a pair of Time Sphere’s which allow him to travel backwards in time. On the initial voyage, he travels to the Mesozoic Age with his assistant Jeff.

While Rip is gone, criminals break into his lab and force Rip’s friend Bonnie and her younger brother Corky to take the other Time Sphere into the past as well. The Time Sphere is damaged upon arrival stranding Bonnie, Corky, and the criminals. To escape they search for Rip and Jeff. The crooks locate Rip’s time sphere and hide it, then they fall into a river and are swept away.

Rip and his companions begin looking for the hidden time sphere, braving the dangers of dinosaurs and an erupting volcano to find it. When they do find it, the crooks return, so Rip takes replacement parts from the Sphere, then sends Bonnie and Corky back to the present. Rip, Jeff, and the crooks find and repair the other Time Sphere and escape a dinosaur stampede before returing to their own time period.