User blog comment:ThisIsBlue/Legends of Tomorrow Season 3: Episode Analysis/@comment-27700324-20171001033108/@comment-1330227-20171002201955

Don't forget Crisis On Earth X from Justice League of America #107-8 and Crisis on Earth Prime from JLA #207-9 and ASS #14-5. Really, there's no shortage of comic stories with the the Justice League fighting evil doppelgangers of themselves.