||Aquaman; The Atom [Ray Palmer]; The Flash [Barry Allen]; Green Arrow [Oliver Queen, of Earth-1]; Green Lantern [Hal Jordan]; Martian Manhunter [John Jones/J'onn J'onzz]; Batman [or Earth-1]; Superman [of Earth-1]; Wonder Woman [of Earth-1] (all as the Justice League of America/JLA); The Atom [Al Pratt]; Black Canary [Dinah Lance, of Earth-2]; Dr. Fate [Kent Nelson, of Earth-2]; The Flash [Jay Garrick]; Green Lantern [Alan Scott]; Hawkman [Carter Hall, of Earth-2]; Hourman [Rex Tyler] (all as the Justice Society of America/JSA); Felix Faust; Dr. Alchemy; Chronos; The Wizard; The Fiddler; The Icicle (all as the Crime Champions)
||3 villains each from Earth-1 and Earth-2 hatch a plot to commit crimes, then hide out on the other Earth. To ensure their success, the villains of Earth-1 mystically trap the JLA in their headquarters. But the JLA summons the JSA and switches places with them.
||1st JLA-JSA Team up. Story continued in Justice League of America #22. Lettering credit from reprint in JLA Archives.
||in DC 100-Page Super Spectacular (DC, 1971 series) #6; in Greatest Team-Up Stories Ever Told, The (DC, 1989 series) #nn; in Crisis on Multiple Earths (DC, 2002 series) #nn ; in Justice League of America Archives, The (DC, 1992 series) #3; in Showcase Presents: Justice League of America (DC, 2005 series) #2; in DC 100-Page Super Spectacular No. 6 Replica Edition (DC, 2004 series) #[nn]