presented in Justice League of America #9, when the Earth is infiltrated by alien warriors sent to conquer the planet, some of the world's greatest heroes join forces, Allen among them. While the superheroes individually defeat most of the invaders, they fall prey to a single alien and only by working together are they able to defeat the warrior. Afterwards, the heroes decide to establish the Justice League. During the years, he is depicted as feeling slightly attracted to Black Canary and Zatanna, but he never pursues a relationship because he feels his real love is Iris West, whom he ultimately marries. Allen also becomes a good friend with Green Lantern (Hal Jordan), which would later be the subject of the limited series Flash and Green Lantern: The Brave and the Bold. In The Flash #123—"Flash of Two Worlds"—Allen is transported to Earth-Two where he meets Jay Garrick, the original Flash in DC Continuity; it is revealed that Jay Garrick's adventures were captured in comic book form on Earth-One. This storyline initiated DC's multiverse and was continued in issues of Flash and in team-ups between the Justice League of America of Earth-One and the Justice Society of America of Earth-Two. In the classic story from Flash #179—"The Flash – Fact or Fiction?"—Allen is thrown into the universe eventually called Earth Prime, a representation of "our" universe, where he seeks the aid of the Flash comic book's editor Julius Schwartz to build a cosmic treadmill so that he can return home. He also gains a sidekick and protégé in Iris' nephew, Wally West, who gains super-speed in an accident similar to that which gave Allen his powers. Tragedy In time, he married his girlfriend Iris West, who learned of his double identity because Allen talked in his sleep. She kept this secret, and he eventually revealed his identity to her of his own free will with Moreno's persuasion. Iris was eventually revealed to have been sent as a child from the 30th century and adopted. In the 1980s, Flash's life begins to collapse. Iris is murdered by Professor Zoom (a supervillain from the 25th century who had long loved her and been jealous of Allen), and when Allen prepares to marry another woman, Zoom tries the same trick again. Allen stops him, killing Zoom in the process by breaking his neck. Unfortunately, when Barry is unable to make an appearance at