Comic Title: Action Comics #350
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: May 1967
On Sale Date: March 30, 1967 Newsstand Date March 30, 1967
Source: House Ad, Superman #196, Page 11

Newsstand Date March 30, 1967
Source: Direct Currents, Superman #196, Page 32

Newsstand Date March 30, 1967
Source: Newsdealer Magazine, V22 #1

Copyright Date March 30, 1967
Source: Library of Congress, Periodicals 1967


Frequency: Monthly (semi-monthly, March)
Cover Price: $0.12
Page Count: 32
Editor: Mort Weisinger

Title: "The Secret of the Stone-Age Superman"
Pages: 14

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

Writer: Otto Binder
Artist: Wayne Boring

Feature Character(s)

• Superman (last appearance in Superman's Girl Friend, Lois Lane #74; next appearance in Superman's Pal, Jimmy Olsen #102)

Supporting Character(s)

• Perry White (last appearance in Superman's Girl Friend, Lois Lane #74; next appearance in Superman's Pal, Jimmy Olsen #102)

Villain(s)

• Guarr and his followers (cavemen; no further appearances)

Other Character(s)

• Superman robot K-31 (no further appearances)
• Virra and members of her tribe (no further appearances)
• A group of spelunkers (no further appearances)

Synopsis:
While vacationing in France, Perry White joins a group of amateur spelunkers. In a cave he discovers a skeleton wearing a Superman costume. The real Man of Steel decides to investigate the strange discovery by traveling back in time to the days of dinosaurs and cavemen.

When Superman arrives in the past he immediately loses his powers. He discovers that the sun is red during this period of history, so he has no powers and is unable to return to his own time period.

Superman soon meets a tribe of cavemen. One of the leaders is Guarr who wants to take Superman's costume. Superman and Guarr battle, but the Man of Steel is at a disadvantage without his powers. Superman is eventually victorious and earns the respect of the tribe.

Soon, a Superman robot arrives. The robot was worried when its master did not return. The robot still possesses its powers and is able to take Superman home. Before leaving, the robot leaves its costume behind. When he returns to the present, Superman deduces that Guarr must have worn the costume, and his body was the one found in the cave.