After a battle led by Darksied on Earth that was worse than the Black Zero Event, the Justice League are finally questioned for their actions. A new girl in town only going by the name of Lena has revealed to the public the Gotham/Metropolis Accords. These accords would make the Justice League work under the power of the United States, while also being able to keep their alter-egos a secret. When the team is informed about this, they're put into a war with each other as Clark Kent (Superman), Diana Prince (Wonder Woman), Ray Palmer (The ATOM), Hal Jordan (Green Lantern) and Ronnie Raymond (Firestorm) agree that the only way they can keep everyone safe is by working for the United States government. However, Bruce Wayne (Batman) Oliver Queen (Green Arrow), Kara Kent (SuperGirl), Barry Allen (The Flash) and Arthur Curry (Aquaman) believe that something may be off about Lena, and that they're perfectly fine without working under the power of the United States. With the team divided, a threat from years ago reawakens, stronger than ever before, and the Justice League will have to fight for their lives, and the people of the world, one last time.
After rescuing Bart from Lex's clutches, Clark agrees with Oliver's plan to blow up the Ridge Facility. Unfortunately, when Oliver reaches into his pocket to remove the detonator, he realizes it's been damaged and will no longer work. Since he's invulnerable, Clark sends the rest of the team out, deciding that he will trigger the explosives manually. Unfortunately, the heat from the explosions turns some of the Green Kryptonite in Lex's vault into Black Kryptonite and as Clark escapes the facility, he doesn't realize that there's another Clark running around - the Red K version.