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The Dark Signers serve as gatekeepers to the door to the underworld. This door resides within the first [[Enerdy]] generator, located in [[Satellite]]. The Dark Signers plotted to open this gate to release the Earthbound Immortals. Knowing this, [[Rex Goodwin]] built the utopia [[New Domino City]] away from Satellite and restricted access between the two cities so that only those left in the Satellite would be harmed when this time came.
Rex's older brother, [[RudgerRoman]], was placed in charge of the first [[Enerdy]] System , developed by Professor Fudo prior to the [[Zero Reverse|Zero Reverse Incident]]. The same incident which released the sealed Immortals from their 5.000 year imprisonment. Presumed killed by the accident, Rudger Roman was reawakened as a Dark Signer.
[[Kalin]] became a Dark Signer after being sentenced to death but came back, fueled with revenge against his former friend [[Yusei Fudo]].
After a dark ritual performed by the Dark Signers in the [[B.A.D.]] area, mysterious black fog covers all of Satellite, absorbing all residents near this zone, seemingly including [[Crow]].
After RudgerRoman's [[Shadow Duel]] against Yusei concludes, the rest of the Dark Signers show themselves to their rivals, the Signers, as their final battle is about to begin. Currently, each Signer travels to one of the 4 controller for the Old Momentum where their corresponding rival is awating. However, as Luna and Leo are taken by Trudge to the controller where Demak is, she is instead transported back to the [[Minus World]] in order to free [[Ancient Fairy Dragon]]. This causes Leo to duel Demak in her place, trying to fulfill his promise of protecting her. After Demak summons his [[Earthbound Immortal Cusillu|Cusillu]], Luna returns from the Spirit World and takes Leo's place. Once Daniel sacrifice Demak sacrificed [[Ancient Fairy Dragon]], in order to activate Cusillu's effect, Luna uses [[Respect Synchron]] to summon Ancient Fairy Dragon to her side of the field thus releasing her and using her and [[Power Tool Dragon]] to destroy Cusillu and defeat Demak.
Despite Demak's defeat and the apparent destruction of Cusillu, the Dark Signers prove to have a contingency plan. [[Greiger]] soon becomes his replacement, using a sixth Earthbound Immortal, [[Earthbound Immortal Chacu Challhua|Chacu Challhua]]. Later Greiger duels against [[Crow]], whom had managed to escaped the fog. Later during the duel, as the new Dark Signer summons his correspondent God, he ultimately finds out the truth about his village: the ones responsible for the destruction of it are actually the same individuals he now works for. Discovering this Greiger loses his will to continue the duel, but suddenly a dark and evil voice known only as an "Envoy of the Underworld" intervenes. The entity possesses him in order to force the duel to continue. In the end, the possessed Greiger is defeated by Crow in the Shadow Turbo Duel, during which Chacu Challhua is destroyed as well.
With his detours settled, Yusei finally reaches [[Earthbound Immortal Ccapac Apu|the Giant]]'s safety switch, and Kalin. Their duel is intense as Yusei tries to save him while Kalin justs wants revenge. As more of the past of Team Satisfaction the Enforcers is revealed, including Kalin's final moments before becoming a Dark Signer, he Summons Ccapac Apu and tries to destroy Yusei with it. However, as he manages to fend off from the Earthbound Immortals Immortal's assault, the Nazca God itself begins to trash the ground where the duel is taking place. As Kalin then experiences difficulties with this Yusei tries to save him by summoning "[[Savior Star Dragon]]" and taking down Ccapac Apu. As Kalin makes peace with him, however, still he withers into dust.
After the battle, Rudger Roman speaks to Yusei through Trudge as he challenges him. Therefore he along with Crow, Luna, Leo and Trudge goes to the [[Enerdy|Old Momentum]]. As they meet with Rudger Roman inside he detonates the Momentum system, thus releasing the negative energy inside. As it fills the room, the two of them, who are above it, finally begins their rematch. During the duel he reveals to him some unfortunate events which occurred between the Dark Signer and Professor Fudo. Rudger Roman also reveals his identity as the fifth Signer. After Yusei finally manages to defeat [[Earthbound Immortal Uru|Uru]], and thereby RudgerRoman, Rudger Roman detonates his left arm as he's dissapearing, blowing up the bridge and sending Yusei falling into the depths of the Old Momentum.
[[File:Envoy_of_the_Underworld.jpg|thumb|Envoy of the Underworld|left]]
However while Misty in the end has summon her powerful [[Bad End Queen Dragon]], Akiza in the other hand has not only unleashed her Black Rose Dragon, but also ultimately has shattered every mirror in the vicinity and finally confronts face to face with her opponent. Akiza and Misty's duel continue while Misty manages to gain the upper hand by summoning Ccarayhua. While she does that Yusei tricks Sayer in revealing the truth behind her brother's death. Upon hearing this she commands her monster to devour him and avenges her brother's death. Before she could surrender the Envoy of the Underworld takes control and is about to finish Akiza off with a direct attack. But Akiza pulls through by blocking the attack and summoning Black Rose Dragon again to destroy everything on the field. Misty tries to counter by inflicting damage through card effect. But Akiza counters the damage and deals it back to her ending the duel with Misty feeling at peace. She vanishes leaving her music box, containing Toby’s and her picture on it.
Later, right after Akiza’s duel against Misty concludes, before the Signers are able to seal the last Tower, the King of the Underworld appears from the Old Momentum, and is moving toward the City. At that time Goodwin who has acquired the powers of a Signer with RudgerRoman's arm, reveals to be the last of the Dark Signers. As the dark mark of the Condor appearing on his back, revealing his Dark Signer nature and giving him supernatural powers, he declares that a [[Shadow Turbo Duel]] will be held within the Condor geoglyph as a ritual to welcome the [[King of the Underworld]].
Therefore Goodwin faces of against Yusei, Jack, and Crow in one final Shadow Turbo Duel. The duel rages fiercely upon them and Goodwin. Though both Jack and Crow are unable to continue due to [[Earthbound Immortal Wiraqocha Rasca|Wiraqocha Rasca's]] deathly effect, Yusei manages to win with both their help.
