The Multiverse and Earth-Two
After the establishment of DC Comics' Multiverse in the 1960s, it is established retroactively that the Golden Age version of Superman lives on the parallel world of Earth-Two and is named Kal-L, while his Silver Age counterpart lives on Earth-One and is named Kal-El. While the Multiverse allowed for DC comics to bring Golden Age stories back into continuity, it also created problems. There had been no break in Superman stories between the Golden and Silver Ages; the character had been published in one ongoing story since his debut. Additionally, DC had had dropped the name Kal-L in favor of Kal-El before the end of the Golden Age. A series of stories in the 1970s establish that the Earth-Two Superman had married his version of Lois Lane in the 1950s (Action Comics #484, (1978)) and had become the editor-in-chief of the The Daily Star. In the late 1970s, Kal-L discovers a Kryptonian rocket that contains his cousin Kara Zor-L. After acclimating to Earth, Kara becomes the superheroine Power Girl. Kal-L also continues to serve with the revived Justice Society; he is revealed as a founding member of the group in the team's origin story in DC Special #29. In the early 1980s, Kal-L is also shown as a member of the All-Star Squadron during World War II.Crisis on Infinite Earths
During the 1985 limited series Crisis on Infinite Earths, the various parallel Earths combine into one, retroactively eliminating some Earth-Two heroes from existence. Kal-L, the Earth-Two Superman, his wife Lois Lane of Earth-Two, the Superboy of Earth-Prime a nd Alexander Luthor, Jr. of Earth-Three, have no reality to call their own, and they enter a "paradise dimension" at the end of the series. This Superman isn't seen again until the limited series The Kingdom, in which it is revealed that he has found a means of exiting his dimension, but chooses not to do so yet.Post-Crisis
DC Comics also retires the Silver Age version of Superman in 1986 after Crisis on Infinite Earths. Just before the character's revamp, the Silver Age Superman is given a sendoff in the two-part story "Whatever Happened to the Man of Tomorrow?", written by Alan Moore with a rt by Curt Swan. Although the new Modern Age version of Superman is said to have already been active for many years, most previous Superman appearances and elements are rendered out of continuity by John Byrne's Man of Steel. Later stories such as Superman: Birthright bring many of the Silver Age elements back into continuity.
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