In Final Crisis Secret Files #1, it was revealed that on the Nazi-dominated Earth-10, a member of Overman's Justice League is Leatherwing, an alternate version of Batman.
Later, during the Final Crisis event, he was featured briefly in a news report with his cave crew under the New York subway system, finding a way to explore the top of the world.
In 2008's Final Crisis event, a team called the Justifiers are controlled by the Anti-Life Equation, and now "justify" Darkseid's rule of the Earth.
Meantime, Superman and the three Legion founders (Cosmic Boy, Saturn Girl and Lightning Lad) are forcefully taken from the midst of the battle to the End of Time by the Time Trapper, who is revealed as an aged Superboy-Prime.
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While Superman leads the Legion into battle against the villains, Brainiac 5 (who was forewarned of Superboy-Prime's invasion by one of Dream Girl's premonitions) sets in motion a master contingency plan against Superboy-Prime that involves recruiting three of Prime's biggest foes.
The Global Peace Agency was brought into the DC Universe proper in Final Crisis #7 (March 2009).
During the events of Final Crisis, Lashina, once again in her bald-headed human form, is seen as one of the villains running the Dark Side Club, an illegal arena where spectators gamble on battles between brainwashed teen metahumans.
In Final Crisis, Mad Harriet was one of the Furies whose spirit possessed some of Earth's heroines and villainess.
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In Countdown #11, Mad Harriet was part of the battle against Mary Marvel, Harley Quinn and the second Catwoman.
1 #4 (September 1971), and was reintroduced in the pages of Final Crisis #2 (August 2008).
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In the second issue of Final Crisis, Sonny Sumo is seen living in present day Japan.
In Final Crisis Stompa was one of the Furies whose spirit possessed the body of one of Earth's heroes or villains.
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Final Crisis Aftermath: Run! (with Freddie Williams, DC Comics, 6-issue limited series, 2009, forthcoming)