Action Comics (Volume 1) with a cover date of April, 1971.
Synopsis for Superman: "Superman, You're Dead... Dead... Dead"
Superman is brought forth to the 24th century along with Washington, Lincoln, and Custer as part of a history class. Escaping from the observation globe Superman is told he is the second of two protoplasmic Supermen created after the original Superman was killed by an energy vampire. Superman is convinced that he must return with the others (who have also been taken from the point just before they died) to perform what is supposed to be his final mission. Superman survives and discovers that the future was that of a parallel Earth.
Appearing in Superman: "Superman, You're Dead... Dead... Dead"
Featured Characters:
Antagonists:
- Energy vampire
Other Characters:
- Abraham Lincoln
- George Custer
- George Washington
- Superman I (Dies in flashback)
- Superman II (Dies in flashback)
- Superman III (Dies in flashback)
Locations:
Items:
- Chrono-selector
Synopsis for Superbaby: "Superbaby's Lost World"
Superbaby gets separated from his parents while visiting an amusement park. He is then found by a pair of jewelry thieves named Connie and Hyde who decide to use the baby as a cover so they can pose as a normal family. They soon discover that the baby has powers that they are unable to handle. Superbaby capsizes their boat while going on a river ride. He then flies the pair of thieves to the top of a makeshift volcano so they can dry off. He eventually leaves the pair hanging on tree branches where they are soon discovered by police. The thieves are more than happy to be taken into custody rather than dealing with anymore adventures with Superbaby. The baby is eventually found by the Kents and they go home while the thieves are carried off in a paddy wagon.
Appearing in Superbaby: "Superbaby's Lost World"
Featured Characters:
Supporting Characters:
Locations:
Notes
- "Superman, You're Dead... Dead... Dead" was reprinted in Superman: From the 30's to the 70's, The Best of DC #12 and Superman: From the 30's to the 80's.
- Leo Dorfman is credited as Geoff Brown in this issue.
- The 24th century portion of "Superman, You're Dead... Dead... Dead" occurred on what was later named Earth-399.
- "Superbaby's Lost World" takes place when Superman was an infant.
- Superman appeared last in Superman's Girl Friend, Lois Lane 109. He appears next in Superman #237.

The events from this issue or series involve a Multiversal Crossover between Pre-Crisis worlds and characters. This template will categorize articles that include it into the Pre-Crisis Multiverse Crossover category.
See also Post-Crisis Multiverse Crossovers.
Trivia
- The cover art to Batman #434 bears many distinct similarities to that of this issue's.
- Some lists of imaginary stories include this issue, but it is not an imaginary story.
See Also
Recommended Reading
- Superman Family Recommended Reading
- Action Comics (Volume 1)
- Adventure Comics (Volume 1)
- DC Comics Presents (Volume 1)
- Superboy (Volume 1)
- Superboy (Volume 2)
- Supergirl (Volume 1)
- Supergirl (Volume 2)
- Superman (Volume 1)
- Superman Family (Volume 1)
- Superman's Girl Friend, Lois Lane (Volume 1)
- Superman's Pal, Jimmy Olsen (Volume 1)
- World's Finest (Volume 1)
Links and References

The events from this issue or series involve a Multiversal Crossover between Pre-Crisis worlds and characters. This template will categorize articles that include it into the Pre-Crisis Multiverse Crossover category.
See also Post-Crisis Multiverse Crossovers.