Supergirl: Identity: 10-19, DCU Infinite Holiday Special

In 1956, DC Comics obtained the rights to the Quality Comics characters, and re-introduced them 17 years later as the Freedom Fighters in Justice League of America #107 (October 1973). The Freedom Fighters were relocated to a parallel world, one called "Earth-X", where Nazi Germany had won World War II. The team was featured in its own series for 15 issues (1976–1978), in which it temporarily left Earth-X for "Earth-One" (where most DC titles are set). In 1981, some Quality Characters became recurring guest-stars of All-Star Squadron, a superhero-team title set on "Earth-Two", the locale for DC's WWII-era superheroes, and at a time prior to when the Freedom Fighters were supposed to have left for Earth-X. They later appeared with the rest of DC's superheroes in Crisis on Infinite Earths, a story that was intended to eliminate the confusing histories that DC had attached to its characters by retroactively merging the various parallel worlds into one. The Freedom Fighters became a mere splinter group of the All-Star Squadron.
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