crime until reaching Metropolis as an adult, therefore this is the first appearance of Earth-One in comics. Superman #76 (1952): the first appearance of the Earth-One Batman, teaming up with what must be Earth-One Superman. The two crime fighters meet for the first time in this story. Their Earth-Two counterparts knew each other from their time in the Justice Society of America in the 1940s. (1954): Superman and Batman books unofficially make the switch from the Earth-Two characters to the Earth-One characters, though it was not apparent at the time. Superman's Pal Jimmy Olsen #1 (1954): debut issue of spinoff title for supporting character from the Superman series. Detective Comics #225 (1955): the first appearance of J'onn J'onzz, the Martian Manhunter. Showcase #4 (1956): popularly the first Earth-One comic (though not mentioned in text as such), featuring the introduction of Barry Allen as The Flash. Adventure Comics #246 (1958): unofficially the first appearance of Earth-One Green Arrow. Wonder Woman #98 (1958): unofficially the first appearance of Earth-One Wonder Woman. Adventure Comics #260 (1959): the first appearance of Earth-One Aquaman. Showcase #22 (1959): the first appearance of Hal Jordan, the Green Lantern of Earth-One. The Brave and the Bold #34 (1961): the first appearance of Katar Hol, the Hawkman of Earth-One. The Flash #123 (1961): "The Flash of Two Worlds" Barry Allen meets Jay Garrick. This is the first story to explain the concept of the Multiverse, namely that the actions of Barry Allen and Jay Garrick took place on separate but similar Earths. Showcase #34 (1961): the first appearance of Ray Palmer, the Atom of Earth-One. Justice League of America #21 (1963): "Crisis on Earth-One" The first team up between the JLA and the JSA, which became a yearly feature in the Justice League of America comic. This is the story in which both Earth-One and Earth-Two were first given names. Green Lantern (vol. 2) #85 (1971): "Snowbirds Don't Fly" A story focusing on drug addiction, showing Green Arrow's ward Roy Harper addicted to heroin. The story won the 1971 Shazam Award for Best Original Story. Justice League of America #100 (1972) A story that establishes that the Green Arrow and Speedy appearing in the 1940s were the Earth-2 Green Arrow and Speedy. This annual JLA/JSA team-up featured the return of the Golden Age superhero team the Seven Soldiers of Victory, of which the Golden Age Green Arrow and Speedy