The Arc Project. In line with the plans of the Fusion Dimension's Duel Academy, the Xyz Dimension's city, Heartland, is pushed to the brink of destruction.
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Yu-Gi-Oh! ARC-V episode 106106: "An Academic Test"
The Arc Project, known as "Aquaria Project" (アークエリア・プロジェクト Ākueria Purojekuto) in the Japanese version, and alternatively known as "Arc-Area Project" in both versions, is the project devised by Leo Akaba and the goal of Duel Academy, which involves the using the power of Fusion to merge the Four Dimensions and revert the worlds to their original state: the United World. According to Duel Academy's prominent military officers and lower ranking soldiers, this would establish a utopia where all people from the various dimensions can live in peace.
This project is shown to require Zuzu and her dimensional counterparts, as well as invading the Xyz and Synchro Dimensions and having their people sealed into cards in order to bring them back to Duel Academy and use their life force to power the project. According to Declan Akaba, Yuya and his counterparts are also important.
When people are turned into cards, the process turns their natural energy, their bodies and souls, into condensed versions, cards, and are all sent without fail to Duel Academy (except for non-unprecedented card transformations like Dennis' or the carded LID students). The project is a means to complete Revival Zero, which requires the gathering of natural energy, the people turned into condensed card versions of themselves, as energy source for the ARC-V Reactor.
Leo, finding the Lancers (led by his son Declan) and Yuya as threat to his Arc Project, decided to send the Tyler sisters to the Xyz Dimension in order to eliminate them as well as the Obelisk Force as insurance.
Ultimately as Declan Akaba noted the Arc Project inadvertently ended up causing Z-ARC's resurrection. The newly resuscitated Supreme King proclaimed he would fulfill his original ambition to devastate the dimensions as revenge for humankind goading him into psychosis and the fear of being defeated.
However, the Lancers and Ray Akaba's opposition towards him prevented this outcome and caused the Standard Dimension's rebirth as the "Pendulum Dimension", while Riley Akaba sealed Z-ARC's soul into herself but at the cost of returning as a despondent and catatonic infant. Riley needed to regain her smile to completely purify Z-ARC's soul. Yuya was compelled by Declan to Duel several of their former allies to restore his younger sister's smile through Dueltaining and overcome his fear of Z-ARC's return. Eventually Yuya confronted Declan in their final Duel to test his aptitude to become a pro Duelist and succeeded in defeating him, restoring Riley's smile and purifying Z-ARC's soul ensuring concord throughout the dimensions.
- Yu-Gi-Oh! ARC-V episode 100100: "A Warlike Welcome"
- Yu-Gi-Oh! ARC-V episode 106106: "An Academic Test"
- Yu-Gi-Oh! ARC-V episode 112112: "Hat-Trick"
- Yu-Gi-Oh! ARC-V episode 03737: "A Dark Reflection"
- Yu-Gi-Oh! ARC-V episode 04141: "Bracing For Battle"
- Yu-Gi-Oh! ARC-V episode 117117: "Grip of the Parasite"
- Yu-Gi-Oh! ARC-V episode 108108: "Twins with Tudes"
- Yu-Gi-Oh! ARC-V episode 127127: "Revival Zero"
- Yu-Gi-Oh! ARC-V episode 126126: "An Evil Ascends"
- Yu-Gi-Oh! ARC-V episode 139139: "Clash Talk"
- Yu-Gi-Oh! ARC-V episode 140140: "A Ray of Hope"
- Yu-Gi-Oh! ARC-V episode 141141: "Swinging Back Into Action"
- Yu-Gi-Oh! ARC-V episode 143143: "Amateur Hour"
- Yu-Gi-Oh! ARC-V episode 148148: "That's A Wrap"