Just as Parallax (now back in his monster form) attacks the Lanterns for freeing Kyle Rayner, Ganthet and Sayd arrive and draw Parallax into four separate lanterns (Hal, Kyle, John, and Guy's, respectively). As Ganthet explains, he and Sayd were kicked out of the Guardians of the Universe. Ganthet's final act as Guardian is to make Kyle a new power ring. He asks if Kyle is willing to downgrade himself to a normal Green Lantern, which Kyle quickly agrees too. The four men then take their lanterns and hearing the Sinestro Corps oath, recite the classic Green Lantern oath, and depart to confront the Sinestro Corps.
After Abin Sur began making periodic visits to the planet Ysmault, where the Five Inversions were imprisoned after the Guardians destroyed their Empire of Tears, he began to ask questions regarding the Blackest Night. Sur even went so far as to free Atrocitus from his imprisonment so he could lead the Green Lantern to Earth, the birthplace of \"the black\" that would end the universe. Caged in Sur's starship, Atrocitus instilled fear in Sur, allowing the yellow impurity to seep into his willpower constructs and weakening them enough to escape. After slashing the Green Lantern in the chest, mortally wounding him, Atrocitus jumped from a point high in Earth's atmosphere to escape Sur's failing ship.
Back at Amnesty Bay, Mera manages to fend off Aquaman and races to help Garth. After she freezes Dolphin's head with a spell, Mera shatters it with her trident. However, Dolphin merely reforms her head and continues to fight Mera. Tula manages to rip out Garth's heart and he is then inducted into the Black Lantern Corps. A hurricane throws Mera onto a parked car. Aquaman, Tula, Garth, and Dolphin then advance on her, but she flees into the fog.
Superman punches a hole in Kal-L's head, making him drop Connor. Kal-El saves him, but the Superman of Earth-Two has disappeared. On Kandor, New Krypton, Alura In-Ze and Kara Zor-El honor the grave of Zor-El. A black ring shoots into his tomb and inducts him into the Black Lantern Corps. He bursts free of his tomb and advances upon Alura and Supergirl.
Superman and Superboy hurry back to the Kent home, only to find it half-destroyed and Krypto wounded among the wreckage. They fly into downtown Smallville, and Connor surmises how the town is deathly quiet. They find Kal-L on top of Jonathan Kent's coffin and Lois Lane of Earth-Two with Martha Kent in Lois' arms. Conner goes after Lois, while Superman continues to battle Kal-L. Meanwhile, Black Lantern Psycho-Pirate is using his Medusa Mask to make the people of Smallville feel different emotions, allowing him to rip their hearts out. Superboy goes after Psycho-Pirate, but he uses his powers on Kon-El, and tells him to fight against Superman, as he and Kal-L are beating Kal-El up. Just as Superman is about to fall unconscious, Conner breaks free of the Psycho-Pirate's control and uses his tactile telekinesis on Kal-L, temporarily destroying him. As Kal-L begins to reform, Superman goes after his Black Lantern counterpart as Conner resumes his battle against Psycho-Pirate. Meanwhile, Martha tries to hide from Black Lantern Lois Lane in a cornfield. She then burns the Black Lantern, but it doesn't stop her. However, it allows Krypto to attack Lois from behind and bite her arm off, taking the Black Lantern Ring with him.
On Zamaron, the Star Sapphires fight against the Sinestro Corps. The Zamarons are impressed and somewhat disturbed to discover that Carol Ferris can resist the ring's control upon herself. Sinestro arrives and frees Kryb, Karu-Sil, and numerous other female Sinestros before fighting Carol.
Back on Zamaron, Sinestro and Carol seem relatively well matched until Carol imprisons Sinestro in a Star Sapphire crystal. This brings back the memory of his lost love, Arin Sur, Abin Sur's sister. Sinestro then breaks free of his crystal and pummels Carol close to the point of unconsciousness. Tekik and the Sinestro of Space Sector 11 are about to execute Carol with Sinestro when a black ring flies through the heart of Sinestro 11. The power levels are charged from 0.01% to 45.43%. Amon Sur and several deceased Sinestros descend from the sky on them, as Black Lanterns.
Meanwhile on Earth, Barry, and the rest of Earth's heroes converge on Coast City, where they are joined by Hal and the other Lanterns. The Lanterns then combine their rings and destroy Scar, and turn their attention to Nekron and the Black Lantern Central Power Battery and unleash their powers on the Battery, but it has no effect on either the Battery nor Nekron, who then reveals the next stage of his plan. Black Hand then resurrects Batman who spits out Black Power Rings while Nekron explains that he was behind every resurrection and they are all still connected to him. Superman, Kid Flash, Superboy, Wonder Woman, Green Arrow, Animal Man and Ice are transformed into Black Lanterns with Barry and Hal fighting away the rings. Barry and Hal try to escape not only the black rings meant for them, but the resurrected heroes that were just transformed into Black Lanterns by Nekron. In order to escape the black rings, Barry has Hal throw him a construct of a line, and runs both of them two seconds into the future, preventing the black rings from targetting them. The Lanterns then realize that even with their combined powers, they are only recreating a fraction of the white light necessary to destroy Nekron and the Battery. So, in order to bolster their ranks, Ganthet initializes a program in Hal's ring, which duplicates it. Ganthet attaches the duplicate on to his hand and inducts himself into the Green Lantern Corps. His last act as Guardian is to initialize the same program in the other power rings to deputize individuals for 24 hours, citing that though each ring is different from each other, they are all based on Oan technology. While Ganthet himself is the Green Lantern Corps deputy, the other duplicate rings seek out beings capable of their respective emotions to serve as a temporary member for each Corps, Saint Walker's ring attaches itself to Flash, while Larfleeze's ring goes to Lex Luthor. Sinestro's ring goes to the Scarecrow. Atrocitus's ring attaches itself to Mera, while Indigo-1's staff welcomes the Atom into the Indigo Tribe, and Carol's ring attaches itself to Wonder Woman, which frees Diana from the Black Lantern Ring attached to her and brings her back to life. In order to fully recreate the white light, Ganthet has Indigo-1 and her tribe bring all the members of the other Corps to Earth, so that they can destroy Nekron and the Black Lantern Corps.
Back on Oa, the Green Lantern Corps continue to battle the Black Lantern Corps and Guy Gardner, who became a Red Lantern after Kyle died. Kyle and the other Lanterns try to get through to Guy to free him from the red ring's influence, but Guy thinks it's a trick by the Black Lanterns and uses both the Red Lantern Ring and the Green Lantern Ring attached to him to attack his friends. Suddenly, the Green Lantern planet Mogo arrives, on an old order given to him by the Guardians of the Universe to use his planet's gravity to suck any infestation on Oa on to his planet and destroy them. Mogo increases his gravity to suck everyone, including the Green Lantern Corps, the Black Lantern Corps, and Red Lantern Guy on to his planet. He disposes of the Black Lanterns by drowning them into his core, and destroys them permanently. As for Guy, he immerses him in a nutrient bath, which removes the toxic effect of the red ring from his body, freeing him from the power of the ring. Now that the Black Lanterns on Oa have been destroyed, the Green Lantern Corps, along with Miri Riam, the Indigo Tribe, and the members of the other Lantern Corps, who then teleport to Earth, where they help John Stewart deal with the Black Lanterns from space, including the dead planet Xanshi.
As Green Lantern and the other Lanterns continue to battle the Black Lantern Corps, they are attacked by the Spectre, who goes after Hal and nearly turns him into a Black Lantern. Ganthet and Sayd free him, but are themselves eaten by the Spectre, but Hal frees them. Hal and Ganthet then create a construct of a stake and drive it into the Spectre, but it has no effect on him. They then realize that the real Spectre is trapped inside the body of Crispus Allen. Hal then has Ganthet summon his Power Battery, as well as Guy's, Johns' and Kyle's batteries as well. He then tells the others that the only being capable of beating the Spectre is Parallax, and that if he joins with the parasite again, then they will beat the Black Lantern Spectre, and separate him from Parallax right after that. Sinestro disagrees with Hal, saying that he joined with Parallax because Coast City was destroyed, but Hal says that he has made peace with that and has Sinestro use his ring to destroy the four batteries and release Parallax. Hal and Sinestro then fight with each other over who gets to bond with Parallax, but Hal wins in the end. But, before he heads towards the entity, Star Sapphire comes over to him and kisses him, saying that she loves him. Hal then joins with Parallax, and we see him in the same uniform he wore when he first joined with Parallax. With the increase in power, Parallax battles the Spectre while the others fight against the Black Lanterns around them. Parallax then goes inside the Spectre's body and finds the real Spectre, and the Black Lantern Ring controlling the body of Crispus Allen. Parallax destroys the ring, which turns Crispus Allen's body back into a corpse, releasing the real Spectre. The Lanterns attempt to free Hal from Parallax, but Parallax fights back, not wanting to separate again from Hal Jordan. Ganthet and Carol manage to pull Parallax out of Hal. Sinestro tries to bond with Parallax, but something pulls Parallax away and he disappears. The Spectre t