Superman & Batman: Generations is the umbrella title of three Elseworlds comic book limited series published by DC Comics in the United States, written and illustrated by John Byrne. A major concept of the series is the avoidance of so-called comic book time; it places Superman, Batman, and the other members of the DC Universe in a single timeline, showing the characters aging and being replaced by their progeny.

The Elseworlds story Batman & Captain America, co-published with Marvel Comics and written/drawn by John Byrne, was released in 1996. The story features Batman and Robin teaming up with Captain America and Bucky to fight the Joker and the Red Skull in 1945. The epilogue of the tale features Dick Grayson as Batman and Bruce Wayne Jr. as Robin. The duo find the frozen Captain America in the 1960s while searching for the Joker Jr. It is from this epilogue that the Generations concept was spun-off and developed.

• 1939: The Vigilantes — Superman and Batman meet for the first time, at the Metropolis World's Fair, where they overcome their initial suspicions of each other to team up and defeat the Ultra-Humanite.
• 1949: Family Matters — Clark Kent is married to Lois Lane, and Bruce Wayne's ward Dick Grayson is leaving for college. Lex     Luthor and the Joker kidnap the pregnant Mrs. Kent.
• 1959: Strange Days — Aliens in need of a champion ask Bat-Mite and Mr. Mxyzptlk to test each other's respective heroes; fortunately, Batman and Superman trick the two imps into turning on each other and convince the aliens to take them instead.
• 1969: Changing Times — Kara Kent now helps her father as Supergirl, while Lois Kent is diagnosed with cancer, and Joel Kent is reported MIA in Vietnam. Dick Grayson, the new Batman, confronts the Joker Jr., who is actually an aged Joker in disguise.
• 1979: Twilight of the Gods — Batman and Supergirl (or Superwoman as her father thinks of her) have become a heroic team and, as Bruce Wayne Jr. and Kara Kent, plan to marry. Lois is still alive, thanks to her physician Dr. Holurt. Bruce and Kara's wedding is disrupted by a super-powered Joel Kent (Joel faked his death in Vietnam after Luthor convinced him that Superman deliberately exposed him to gold kryptonite so Joel could not replace him).
• 1989: Crime and Punishment — Bruce Wayne Jr., the third Batman, flies to the Fortress of Solitude to arrest Superman for murder. Superman had been hunting Luthor for the past 10 years and finally caught up with him (but not before Luthor engineered the deaths of Jimmy Olsen, Perry White Jr., and Lucy Lane). Luthor exposed Superman to gold kryptonite and revealed that he is really the Ultra-Humanite.
• 1999: Beginnings and Endings — Batman III is brought to Ra's al Ghul, who is revealed to be Bruce Wayne, Sr. In 1979 Wayne had entered a Lazarus Pit with Ra's al Ghul after Ra's discovered that, if two people entered the Pit, one would perish while the other would survive with permanent immortality and none of the accompanying madness. Wayne survived and discovered that Ra's was correct. In the years since, Wayne turned Ra's's criminal empire into a force for good, working so subtly that everyone assumed his actions were a front for a criminal scheme without realizing that the 'front' had become the real organization.
• 2919: Nineteen Twenty-Nine — Batman visits Superman in his Fortress of Solitude, now an asteroid in a distant galaxy. Due to Superman's Kryptonian heritage and Batman's Lazarus Pit treatment, the two have aged at a very slow rate. As they reminisce, Superman recalls that they had actually met in 1929 when they were teenagers. Clark and Lois Lane were winners of a journalism contest held by Bruce Wayne, owner of the Gotham Gazette.