A crisis in the DC Universe is an event with potentially great consequences, often involving multiple universes and sometimes even threatening their existence. From 1963 to 1985 the term "crisis" was used to describe the annual events in which the Justice League of America of Earth-One and the Justice Society of America of Earth-Two met and worked together, usually in an incident involving one or more of the parallel worlds of the DC Multiverse. This usage culminated in 1985's year-long Crisis on Infinite Earths, in which the Multiverse was eliminated. After several years of disuse, the term "crisis" was applied to several events with either "universal" stakes or substantial character consequences, such as Zero Hour: Crisis in Time!, Identity Crisis, Infinite Crisis, and Final Crisis.