The third day of the preliminaries begins with Yuma looking for one more Heart Piece. Meanwhile, Nistro who wants to defeat Yuma and Astral, enters the tournament along with Dextra. Consequently while collecting Heart Pieces, Nistro challenges Nelson Andrews.
Yuma finds himself in conflict about the "Number" cards, knowing that both Kite and Astral have their reasons for obtaining them. However upon learning that his father is still alive, Yuma tries to leave in search for him. Roku appears to help Yuma with his situation.
Due to the terror of Trey and Quattro's strategy, Kite and Yuma are pushed into a corner. However at the edge of defeat, Hart's feelings awaken a new power inside Kite. With it, he Summons the monster created by the powerful bonds between them, "Neo Galaxy-Eyes Photon Dragon".
The Tag Duel of Yuma and Kite against Quattro and Trey begins! Kite duels essentially on his own, even to the extent of hurting all of his opponents, including Yuma. However, Yuma on his part, defends himself and Kite from Trey and Quattro's damaging combination. Furthermore, even with "Galaxy-Eyes Photon Dragon" being Summoned, it falls victim to Quattro and Trey's trap.
Hart is kidnapped by the Vetrix Family and so Kite and Yuma join forces. However when they find their hideout, they're forced into a Tag Duel against Quattro and Trey.
To heal his little brother Hart's illness, Kite rigorously continues hunting the "Number" cards. Seeing his older brother exhausted, Hart sneaks away from Heartland and into Heartland City, and by chance meets Yuma, Astral and Tori. Amazingly, Hart can see Astral, who in turn seems to know Hart's name. Moved by Astral's wish, Yuma takes Hart to his home. After Hart escaped from the Heartland Tower, he is chased by Dextra and Nistro in a helicopter which results in them going to a tower in order to meet Kite. Soon after, a helicopter appears, in which Hart, Yuma and Tori think it is Nistro and Dextra, resulting in Hart using his Dark Energy. After Yuma calms Hart down with a piece of caramel, the helicopter lands, but instead of Dextra and Nistro, the person piloting it was in fact Quinton. He uses his crest to take control of Hart in order to take him to Vetrix. He then flies off, leaving Yuma and Tori confused as to who he was and what he wanted with Hart.
Yuma's Heart Pieces are stolen by Pip, and Cathy Duels to get them back.
The curtain is about to fall for the last time. The final battle between Yuya and Reiji rages on. Dragons face off against D/D/D as the whole world watches. What will be the final fate of Yuya, Yuzu, and all four dueling dimensions?
Yuya finally listens to his other selves and summons all four of his dragons to defeat Jack. However, there is one final challenge before him in order to become a Dueltainer and purge Zarc: his rival and friend Reiji Akaba.
Yuya finally listens to his other selves and summons all four of his dragons to defeat Jack. However, there is one final challenge before him in order to become a Dueltainer and purge Zarc: his rival and friend Reiji Akaba.
Jack appears to taunt Yuya over his fear of using his counterpart's dragons in fear of summoning Zarc. Unable to accomplish anything as is, Yuya challenges Jack to a duel while Reiji makes it so everyone can watch the battle.
Yuya arrives in the Fusion Dimension where he finds a distraught Shun. Like with Yuya's counterparts, Ruri and the others have not been resurrected following Ray's revival. Yuya tries to calm Shun down only to end up the target of his fury.
The battle royale continues. As Yuya keeps fighting, his memories start flooding back to him. Yuzu's dad suddenly remembers too as the rest of the world slowly begins to remember the Lancers and the battle against Zarc.
Things have seemingly returned to normal in the Pendulum Dimension, but Yuya gets the feeling that something is missing. Reiji has him duel against Tsukikage to restore his memories and make him finish the Lancer's goal for good.
Ray's soul possesses Reira so she can battle against Zarc alongside Reiji. Zarc boasts that he is the creator of Pendulum Summon, but Ray is determined to stop him once and for all using the four natural energy cards.
Crow notices that Zarc is starting to lose his composure, leading him and Sawatari to up their game against Zarc's dragons. As dimensional integration is getting closer to completion, Reiji tries to convince his dad to stop Zarc.
Gongenzaka and Jack fight against Zarc next, trying their best to reach out to Yuya's soul buried in Zarc's darkness. A revived Crow and Sawatari decide to join in when Zarc's Supreme King Dragons swarm the field.
The four dimensions continue to unite as Zarc effortlessly crushes Sora and Edo. Kaito and Shun continue the fight against Zarc while people from Heartland and Neo Domino City start appearing in the Fusion Dimension.
Yuya absorbs all of his counterparts and reclaimed his true form as Supreme King Z-ARC. Starting to lay waste to the Fusion Dimension, Sora and Edo challenge Zarc to try and reach out to Yuya's spirit.
The four dimensions start to fuse together as Yuya continues to struggle against Yuri. Forced to discard his trump card, things seem hopeless. Yuya's friends then arrive to encourage him to keep fighting no matter what.