“PRISONERS OF 100 MILLION B.C.” Featuring the origin and first appearance of Rip Hunter! Having finished work on Time Sphere II, Rip Hunter and Jeff Smith take a trip back to the Mesozoic era!

Developing a means of time travel, adventurer Rip Hunter travels back to a prehistoric age to share adventures with his friends. In this issue, Rip finds himself back in the year 100 Million B.C.and with the task of facing down a dinosaur who is about to devour his friends Corky and Bonnie. Can Rip not only do that, but return himself and his comrades back to the present?