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The 20th century was a turning point in the history of Earth. The population explosion following World War II caused an increase in the crime wave. To counterbalance this, many humans took up vigilantism or used scientific advancements to fight crime. By the end of the century, mankind had begun working on splicing the genome, gaining advances in nanotechnology, and had sent small ships out to Alpha Centauri. Earth had just begun contact with the galactic community.


  • Cyrus Gold is killed and his body is dumped into a mystical swamp. He begins the process of transforming into Solomon Grundy. (JL: The Terror Beyond)







Late 1940s

  • Aresia is brought to Themyscira by a sea captain after a battle and a shipwreck. (JL: Fury)
  • Solomon Grundy rises from the dead, and becomes an urban legend among the populace. (JL: The Terror Beyond)


Early 1960s

  • The last Justice Guild comic book is released parallel to the deaths of the Justice Guild in a parallel universe. (JL: Legends).
  • Jax-Ur and Mala are imprisoned in the Phantom Zone for instigating an uprising on the planet Krypton.

Mid 1960s

Late 1960s


Early 1970s

Mid 1970s

Late 1970s

  • Bruce Wayne travels abroad to learn to be a crime-fighter. He begins by studying to be a detective, and he also studies science under Nobel laureates. (BTAS: Night of the Ninja)


Early 1980s

  • Bruce Wayne spends a month under magician Zatara's tutelage. While there, he learns escape artistry, and he develops an attraction to Zatara's daughter Zatanna. He goes by the name John Smith. (BTAS: Zatanna)

Mid 1980s


  • After many years abroad, Bruce Wayne returns to Gotham City. While attending college, he meets and gets engaged to Andrea Beaumont, daughter of Carl Beaumont. When Carl's mobster connections force them to move, Andrea breaks her engagement to Bruce. Around the same time, Bruce, still haunted by his parents' deaths, begins crime-fighting. At first, he attempts to do it dressed in common clothes, but then realizes that he must strike fear into the heart of his enemies and dons cape and cowl to become Batman. (Batman: Mask of the Phantasm)


Late 1980s

  • Carl Beaumont is murdered by a hitman hired by Sal Valestra. (Batman: Mask of the Phantasm)



  • During a fight between Batman and Sal Velestra's goons, a mobster is dropped into a vat of acid, and becomes the Joker. (TNBA: Mad Love)