Justice League of America #107

CRISIS ON EARTH-X The Justice League and Justice Society test the Trans-matter Cube, a new device for travel between their parallel Earths, but the machine malfunctions when the Red Tornado stows away, in an attempt to return to his home world. Batman, Green Arrow, and Elongated Man, together with Dr. Fate, Sandman, and Superman of Earth-2 are hurled into Earth-X—yet another parallel world, where the Nazis won World War II, and have invaded America. They are rescued from attacking German soldiers by the Freedom Fighters, the last surviving super-heroes of this world: Doll Man, Phantom Lady, Human Bomb, Black Condor, the Ray, and Uncle Sam. Dr. Fate pinpoints the locations of a series of mind-control ray-projectors used by the Nazis to consolidate their conquest, and the three teams of heroes unite to destroy them. Batman, Dr. Fate, the Ray, and the Human Bomb invade the Eiffel Tower, and battle four demonic creations of a Nazi computer, but the destruction of the first mind-control device yields no positive results