Comic Title: Action Comics #399
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: April 1971
On Sale Date: February 25, 1971 Copyright Date February 25, 1971
Source: Library of Congress, Periodicals 1971

Frequency: Monthly
Cover Price: $0.15
Page Count: 32
Editor: Murray Boltinoff

Title: "Superman, You're Dead... Dead... Dead"
Pages: 15

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

Writer: Leo Dorfman
Penciller: Curt Swan
Inker: Murphy Anderson
Letterer: John Costanza

Reprinted In:
Superman from the Thirties to the Seventies HC (1971)
Best of DC #12 (1981)
Superman from the 30s to the 80s HC (1983)

Feature Character(s)

• Superman (last appearance in Superman's Pal Jimmy Olsen #138; next appearance in Justice League of America #89)

Other Character(s)

• Researchers at the 24th Century Historical Foundation (no further appearances)
• George Washington, Abraham Lincoln, and George Custer (from a parallel Earth; no further appearances)
• Superman I, Superman II, and Superman III (all from a parallel Earth; in flashback; no further appearances)

Synopsis:
While attempting to stop an out-of-control solar furnace, Superman is whisked away through time. He lands in a crystalline dome with George Washington, Abraham Lincoln, and George Custer. Superman escapes the dome and finds himself in a 24th Century museum. The researchers at the museum brought the historical figures into their time moments before their own deaths. Superman is told that he is actually the third Superman. Two others had died previously. He sees their bodies.

Superman is convinced by the researchers who then send Superman back to his own time. He believes he will die stopping the solar furnace, but he doesn't. Superman then realizes that the research lab must have existed on a parallel Earth. Some of their facts such as Washington freeing the slaves were clearly wrong indicating that their history was different. On his Earth, Superman is the only Superman, and he is still alive.