Crisis On Infinite Earths. A massive conflict that spanned the
Multiverse, engineered by the malevolent entity known as the
Anti-Monitor, who hailed from the
Anti-Matter Universe. The Crisis involved a multitude of super-powered beings from several realities, both heroes and villians, among them
Superman of Earth-1 and the
Superman of Earth 2, all of whom to varying degrees and in various roles sought to prevent the Anti-Monitor from destroying the Multiverse, and later the positive matter universe. It is also recognised as the conflict in which
Supergirl tragically lost her in life, and during which Superman encountered the
Superboy of Earth-Prime .
When the Crisis was over, and the Anti-Monitor defeated, only one universe and one reality remained. However, it should be noted that in the immediate aftermath of the Crisis, the history and life of the Superman of Earth-1 remained intact. However it is doubtless that any event in which he had encountered a being from another reality, such as Kal-L of Earth-2, had been erased from history. (Based on synopsis information and conjecture from issues ?)
The entry is ready to go up, so can anyone give the list of the Crisis crossover issues?
BTW, I'd too back the change of 'Multiverse' to 'Infinite Worlds'.