Memory Thief: Part 1.As Yuma remains reclusive following Astral's disappearance, Don Thousand gives Vector the remnants of Number 96's power, who is revealed to be a shard of Don Thousand's malice that was trapped inside of Astral, during Astral's ancient battle with Don Thousand. Number 96 is also revealed to be a "Forbidden Number." Then, Don Thousand reveals his plan to use his new powers from Number 96 to make a Fusionizer, to merge the Human World with Barian World, once the level of evil in the Human World reaches that of Barian World. This would increase Don Thousand's power by a thousandfold, giving him enough power to destroy Astral World. In order to create more Fuzionizers, Don Thousand emerges from Vector's body in a black energy form resembling his true likeness, and fuses Vector to his throne, in order to concentrate their energy on making more Fusionizers. Then, using his newly enhanced powers, Vector returns Mr. Heartland to his human form, grants him four Fake Number cards, and gives him a group of 3 Barian servants, who, along with Mr. Heartland, make up the Fearsome Four of the Dark Dueling World. Mr. Heartland distributes 3 of the Number cards among the other members of the Fearsome Four, while he keeps Number 1. Soon afterwards, a servant named Erazor begins attacking duelists and stealing their memories. When Tori and the others try looking into the incident to cheer Yuma up, they are caught by Erazor, who steals their memories and uses them as bait to lure Yuma into a duel. Heartland attempts to coerce Yuma into giving up his Numbers to save his friends, but he remains determined to cling onto the Numbers that Astral had left him. He is soon joined by Trey, who offers to support Yuma in a 2-on-1 duel against Erazor. However, Mr. Heartland uses Don Thousand's power (which manifests in a crest-like form of Don Thousand's Barian Emblem) to activate a field effect, which puts Yuma and Trey at a distinct disadvantage against Erazor, by reducing their Life Points to 2000, and raising Erazor's Life Points to 8000. Then, Erazor shows his true Barian form: a large cicada-like creature.