The Adult Legion is a possible future of the original Legion of Super-Heroes, featuring members of the primary Legion as adults, with members like Cosmic Man, Lightning Man and Saturn Woman. Whereas the regular Legion's stories regularly revolved around Superboy, the Adult Legion would have them interacting with the fully-grown Superman.
For a long time, the Adult Legion was considered the definitive future for the Legionnaires, and was often used as inspiration for new character developments in the regular team. Many long-standing Legion relationships appeared first in the Adult Legion. However, stories by later writers distanced the team from the Adult Legion, and Legion of Super-Heroes (Volume 2) #300 specifically showed it to be only a possible future. Its final appearance was during the Absolute Power arc of Superman/Batman, where the Adult Legion of Super-Villains kidnapped and brainwashed Superman and Batman in an attempt to have them steer the timeline towards their particular future. They were unsuccessful, and the Adult Legion was completely erased.
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